Six bells commence tolling together and toll at intervals

1. 👉 Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together ?

1. A. 4

2. B. 10

3. C. 15

4. D. 16

1. 👉 Answer & Explanation:

   L.C.M. of 2, 4, 6, 8, 10, 12 is 120.

   So, the bells will toll together after every 120 seconds (2 minutes).

   In 30 minutes, they will toll together   (30 / 2) + 1

   ⇒ 16 Times

1. Related Question:

1. Rs. 25000 amount of Rs. 2600 in 5 years at simple interest. If the interest rate were increased by 3%, it would amount to how much?

1. A. Rs. 2900
2. B. Rs. 3200
3. C. Rs. 3600
4. D. None of these

1. Answer : A ( Rs. 2900 )

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1. A farmer borrowed Rs. 5000 at 10% per annum. At the end of 5 years he cleared his account by paying Rs. 3000 and a cow. The cost of the cow is ?

1. A. Rs. 4000
2. B. Rs. 4200
3. C. Rs. 4500
4. D. Rs. 4800

1. Answer : C ( Rs. 4500 )

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1. The simple interest accrued in 2 years on a principal of Rs.24000 is one-eighth of the principal. What is the rate of simple interest p.c.p.a?

1. A. 5
2. B. 4.5
3. C. 6.25
4. D. 7.25

1. Answer : C ( 6.25 )

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1. If the simple interest for 5 years be equal to 25% of the principal, it will be equal to the principal after

1. A. 10 years
2. B. 20 years
3. C. 30 years
4. D. 40 years

1. Answer : B ( 20 years )

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1. The simplest interest on a sum of money is one-ninth of the sum. The number of years is numerically equal to the rate per cent per annum. The rate per cent is

1. A. 3(1/3)
2. B. 5
3. C. 6(2/3)
4. D. 10

1. Answer : A ( 3(1/3) )

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1. X, Y, Z are three sums of money such that Y is the simple interest on X and Z in the simple interest on y for the same time and rate. Which of the following is correct ?

1. A. y² = xz
2. B. y = xz
3. C. x = yz
4. D. z² = xy

1. Answer : A ( y² = xz )

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1. A person takes a loan of Rs. 200 at 5% simple interest. He returns Rs. 100 at the end of one year. In order to clear his dues at the end of 2 years, he would pay

1. A. Rs. 125.50
2. B. Rs. 110
3. C. Rs. 115.50
4. D. None of these

1. Answer : C ( Rs. 115.50 )

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1. A sum of money invested at simple interest triples itself in 8 years. How many times will it become in 20 years time?

1. A. 8 times
2. B. 7 times
3. C. 6 times
4. D. None of these

1. Answer : C ( 6 times )

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1. What will be the ratio of simple interest earned by certain amount at the same rate of interest for 5 years and that for 15 years?

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

1. Answer : C ( 1 : 3 )

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1. The compound interest on Rs. 30,000 at 7% per annum is Rs. 4347. The period (in years) is:

1. A. 1
2. B. 1.5
3. C. 2
4. D. 2.5

1. Answer : C ( 2 )

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1. The age of a man is three times the sum of the ages of his two sons. Five years hence, his age will be double of the some of the ages of his sons. The father’s present age is :

1. A. 29 years
2. B. 36 years
3. C. 42 years
4. D. 45 years

1. Answer : D ( 45 years )

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1. One year age, Promila was four times as old as her daughter Jenilia. Six years hence, Promila?s age will exceed her daughter’s age by 9 years. The ratio of the present ages of Promila and her daughter is :

1. A. 13:4
2. B. 14:5
3. C. 15:5
4. D. 16:5

1. Answer : A ( 13:4 )

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1. There were 15 students in a class. When the ages of a teacher and a new boy are added, the average age of the class increases by 10 per cent while it remains the same when only the age of a boy is added. If the teacher's age is eight more than twice the age of the new boy, then find the initial average age of the class.

1. A. 15.4 years
2. B. 16.5 years
3. C. 11.4 years
4. D. None of these

1. Answer : C ( 11.4 years )

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1. The sum of ages of a father and son is 45 years. Five years ago, the product of their ages was four times the father's age at that time. The present age of the father is

1. A. 39 years
2. B. 36 years
3. C. 25 years
4. D. None of these

1. Answer : B ( 36 years )

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1. In a cricket 11, the average age of 11 players is 28 years. Out of these, the average ages of three groups of three players each are 25 years, 28 years and 30 years, respectively. If in these groups, the captain and the youngest player are not included and the captain is eleven years older than the youngest player, what is the age of the captain?

1. A. 33 years 
2. B. 34 years 
3. C. 35 years 
4. D. 36 years 

1. Answer : C ( 35 years  )

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1. The average age of a husband, his wife and son 3 years ago was 27 years and that of his wife and son 5 years ago was 20 years. What is the husband's present age?

1. A. 35 years
2. B. 32 years
3. C. 37 years
4. D. 40 years

1. Answer : D ( 40 years )