The average of 11 numbers is 30. If the average of first six

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   The average of 11 numbers is 30. If the | Solutions

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5. The average of 11 numbers is 30. If the average of first six numbers is 17.5 and that of last six is 42.5, then what is the sixth number?

1. A. 30           👈Correct Answer
2. B. 36
3. C. 45
4. D. 50

1. Answer & Explanation:

   Sum of 11 Number is 11 x 30 = 330

   
   

   Given : 

   
   

    [ Avg of first 6 numbers is 17.5, so Sum of first Six Number is 6 x 17.5 ]
   
    [ Avg of Last 6 numbers is 42.5, so Sum of last Six Number is 6 x 42.5 ]
   
   6th Number :  ( Sum of first Six Number + Sum of last Six Number ) - 330
   
   Hence the 6th Number is 30

1. Related Question on The Average of:

1. The average marks scored by Ganesh in English, Science, Mathematics and History is less than 15 from that scored by him in English, History, Geography and Mathematics. What is the difference of marks in Science and Geography secured by him?

1. A. 40
2. B. 50
3. C. 60
4. D. Data inadequate

1. Answer : C ( 60 )

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1. The average weight of three men A, B and C is 84 kg. D joins them and the average weight of the four becomes 80 kg. If E, whose weight is 3 kg more than that of D, replaces A, the average weight of B, C, D and E becomes 79 kg. The weight of A is

1. A. 65 kg
2. B. 70 kg
3. C. 75 kg
4. D. 80 kg

1. Answer : C ( 75 kg )

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1. In a class of 100 students the average marks obtained by a student in Maths is 44. If we remove the highest and the lowest the average of the class becomes 43.92. A total of three students get either highest or lowest. What is the average of these three students?

1. A. 73.33
2. B. 46.66
3. C. 59.99
4. D. cannot be determined

1. Answer : B ( 46.66 )

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1. Find the average of first 20 natural numbers ?

1. A. 6
2. B. 7.5
3. C. 10.5
4. D. 12

1. Answer : C ( 10.5 )

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1. The average of 8 men is increased by 2 years when 2 of them whose ages are 21 and 23 years as replaced by two new men. The average age of two new men is 

1. A. 22 years
2. B. 24 years
3. C. 28 years
4. D. 30 years

1. Answer : D ( 30 years )

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1. The average age of a class is 15.8 years. The average age of the boys in the class is 16.4 years and that of the girls is 15.4 years. What is the ratio of boys to girls in the class ?

1. A. 2 : 3
2. B. 2 : 4
3. C. 3 : 4
4. D. 3 : 5

1. Answer : A ( 2 : 3 )

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1. The average weight of 8 men is increased by 1.5 Kg when one of the men who weights 65 Kg is replaced by a new man. The weight of the new man is

1. A. 65 Kg
2. B. 77 Kg
3. C. 82 Kg
4. D. 90 Kg

1. Answer : B ( 77 Kg )

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1. A hiker walked for two days. On the second day, the hiker walked 2 hrs. longer and at an average speed of 1 km per hour faster than he walked on the first day. If during the two days he walked a total of 64 km and spent a total of 18 hrs. walking, what was his average speed on the first day?

1. A. 2 km/h
2. B. 3 km/h
3. C. 4 km/h
4. D. 5 km/h

1. Answer : B ( 3 km/h )

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1. The average age of 8 persons in a committee is increased by 2 years when two men aged 35 years and 45 years are substituted by two women. The average age of these two women is

1. A. 41 years
2. B. 45 years
3. C. 48 years
4. D. 53 years

1. Answer : C ( 48 years )

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1. Of the four numbers whose average is 60, the first is one-fourth of the sum of the last three. The first number is

1. A. 15
2. B. 45
3. C. 48
4. D. 25

1. Answer : C ( 48 )

MongoDB Drop, Truncate and Delete Collection

We will perform all the mongoDB Aggregation Operator on studentInfo DB. Create studentInfo Database in MongoDB server. Use the below code for creating the DB.

  

In the above studentInfo Mongo Database we will create many collection and we will perform mongoDB Delete Collection.

Use command db.createCollection("collectionName")  , this query we will use and create collection in the studentInfo DB.

Below is the video reference for dropping and deleting the Collection in Mongo.




Create Collection In studentInfo DB, below is the query to create the collection.

db.createCollection("studentPersonal") 

db.createCollection("studentMarks")

studentPersonal, studentMarks Collection will be created using above two Mongo Query.

Mongodb Drop Collection Query

Now we will use db.collectionName.drop()  for dropping collection in MongoDB. So as we created the collection named with studentPersonal and studentMarks. MongoDB delete and Drop collection will perform in these two collection.

db.studentPersonal.drop()

db.studentMarks.drop()

This above two query will delete the studentPersonal and studentMarks collection from MongoDB.

Note : If there will not be a single collection in the mongoDB then the studentInfo DB will not be visible.

Mongodb Truncate Collection Query

Sometime you want to truncate the Collection in MongoDB instead of Dropping or Deleting the Collection. In that case you must use remove() method on the collection which you want to truncate.

Syntax for MongoDB Collection Truncate 

db.collection.remove(<query>,<justOne>)

So if we want to truncate the collection we must have to use remove() method. <justOne > is optional here which limits the deletion of document.

We will Truncate the teacherInfo Collection using below command.

db.teacherInfo.remove({})

This above query will truncate the collection in MongoDB.

Maharashtra GK Question and Marathi General Knowledge

1. 
   

   In which year, Bombay city has been officially renamed as Mumbai

1. A. 1992     
2. B. 1995        Correct Answer
3. C. 2000      
4. D. 2003      

2.  

   
   

   Which fort is the birthplace of Chhatrapati Shivaji Maharaj

1. A. Raigad     
2. B. Daulatabad      
3. C. Shivneri        Correct Answer
4. D. Sinhgad      

3.  

   
   

   Which one is the highest point in Maharashtra

1. A. Kalsubai       Correct Answer
2. B. Raigad      
3. C. Lohagad      
4. D. Mahabaleshwar      

4.  

   
   

   Who is known as the Political Guru of Mahatma Gandhi

1. A. Ravindra Kelekar     
2. B. Bal Gangadhar Tilak      
3. C. Gopal Krishna Gokhale        Correct Answer
4. D. None of the Above      

5.  

   
   

   Who was the first Chief Minister of Maharashtra

1. A. Yashwantrao Chavan       Correct Answer
2. B. P. K. Sawant      
3. C. Vasantrao Naik      
4. D. Shankarrao Chavan      

6.  

   
   

   Which day is celebrated as the Maharashtra Day

1. A. 3rd June     
2. B. 1st May        Correct Answer
3. C. 16th August      
4. D. 3rd September      

7.  

   
   

   In which year the Bombay High Court was established

1. A. 1856     
2. B. 1862        Correct Answer
3. C. 1896      
4. D. 1906      

8.  

   
   

   Approximately how many forts are there in Maharashtra

1. A. 150     
2. B. 200      
3. C. 270      
4. D. 350        Correct Answer

9.  

   
   

   Total number of Districts in Maharashtra

1. A. 23     
2. B. 32      
3. C. 36        Correct Answer
4. D. 42      

10.  

    
    

    Which marathi newspaper was published by Bal Gangadhar Tilak

1. A. Sakal     
2. B. Kesari        Correct Answer
3. C. Darpan      
4. D. Poona Vaibhav      

11.  

    
    

    When the third battle of Panipat was fought between Maratha and Afghan army

1. A. 1761       Correct Answer
2. B. 1769      
3. C. 1792      
4. D. 1806      

12.  

    
    

    In which year, Elephanta Caves designated as a UNESCO World Heritage Site

1. A. 1972     
2. B. 1978      
3. C. 1982      
4. D. 1987        Correct Answer

13.  

    
    

    Which one is the longest river in Maharashtra

1. A. Krishna River     
2. B. Tapti River      
3. C. Bhima River      
4. D. Godavari River        Correct Answer

14.  

    
    

    The Maharashtra State was formed by the Bombay Reorganisation Act in the year

1. A. 1956     
2. B. 1958      
3. C. 1960        Correct Answer
4. D. 1964      

15.  

    
    

    Total number of Parliamentary Constituency

1. A. 32     
2. B. 28      
3. C. 42      
4. D. 48        Correct Answer

16.  

    
    

    Who was the first Marathi litterateur to win the Jnanpith Award

1. A. Laxmanshastri Joshi     
2. B. Vinda Karandikar      
3. C. Ravindra Kelekar      
4. D. V.S. Khandekar        Correct Answer

17.  

    
    

    Who is known as the spiritual guru of Shivaji

1. A. Eknath     
2. B. Tukaram      
3. C. Ramdas Swami        Correct Answer
4. D. Gora Kumbhar      

18.  

    
    

    What is the literacy rate of Maharastra according to 2011 census

1. A. 80.23 %     
2. B. 82.34 %        Correct Answer
3. C. 85.22 %      
4. D. 89.11 %      

19.  

    
    

    The Bandra" Worli Sea Link Bridge was opened for public in the year

1. A. 2007     
2. B. 2009        Correct Answer
3. C. 2010      
4. D. 2011      

20.  

    
    

    In which year the Mumbai University was established

1. A. 1845     
2. B. 1850      
3. C. 1853      
4. D. 1857        Correct Answer

21.  

    
    

    Who was the first person of Maharashtra to received Bharat Ratna Award

1. A. B R Ambedkar     
2. B. Vinoba Bhave      
3. C. Dhondo Keshav Karve        Correct Answer
4. D. Lata Mangeshkar      

22.  

    
    

    The Nagpur city is also known as the _________ city of India

1. A. Orange       Correct Answer
2. B. Mango      
3. C. Banana      
4. D. Apple      

23.  

    
    

    Which king of England had been presented with the Mumbai city as a dowry from Portugal

1. A. James VI     
2. B. James II      
3. C. Charles II        Correct Answer
4. D. Henry VIII      

24.  

    
    

    In which year the construction of Chatrapati Shivaji Terminus was completed

1. A. 1888       Correct Answer
2. B. 1892      
3. C. 1898      
4. D. 1903      

25.  

    
    

    The Bhoodan movement was started by ___________ in 1951

1. A. Baba Amte     
2. B. Vinoba Bhave        Correct Answer
3. C. Medha Patkar      
4. D. Vinayak Damodar Savarkar      

26.  

    
    

    Which one is recognised as state tree in Maharastra

1. A. Banyan Tree     
2. B. Jackfruit Tree      
3. C. Neem Tree      
4. D. Mango Tree        Correct Answer

27.  

    
    

    Who was the first Vice Chancellor of Mumbai University

1. A. John Wilson       Correct Answer
2. B. William Guyer Hunter      
3. C. N. G. Chandavarkar      
4. D. Raymond West      

28.  

    
    

    In which year, the construction of Gateway of India was completed

1. A. 1911     
2. B. 1917      
3. C. 1924        Correct Answer
4. D. 1928      

29.  

    
    

    The Gateway of India was erected to mark the landing of which King

1. A. James VI     
2. B. Edward VII      
3. C. George V        Correct Answer
4. D. George VI      

30.  

    
    

    Which one is the largest district by area wise in Maharastra

1. A. Pune     
2. B. Ahmednagar        Correct Answer
3. C. Nashik      
4. D. Solapur