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Tricky Questions on Ages

Ages - Aptitude

11. The sum of ages of 5 children born at the intervals of 3 years each is 50 years. What is the age of the youngest child?

A. 2 years

B. 4 years

C. 8 years

D. 10 years

x

 

Option: B

Explanation

Consider the ages of 5 children be X, (X + 3), (X + 6), (X + 9) and (X + 12) years

sum of 5 children is 50

then, X + (X + 3) + (X + 6) + (X + 9) + (X + 12) = 50

5X + 30 = 50

5X = 20

X = 4

i.e) Age of the youngest child = 4 years.

Answer


12. Prabhu got married 8 years ago. His present age is

6
5
  times his age at the time of his marriage. Prabhu's sister was 10 years younger to him at the time of his marriage. The age of Prabhu's sister is:

A. 18 years

B. 20 years

C. 24 years

D. 32 years

x

 

Option: A

Explanation

Consider Prabhu's present age be X years

then, his age at the time of marriage = (X - 8) years

now, X =

6
5
(X - 8)

5X = 6X - 48

X = 48

Prabhu's sister's age at the time of his marriage = (X - 8) - 10 = (X - 18) = (48 - 18) = 30 years

i.e) Prabhu's sister's present age = (30 + 8) years = 38 years

Answer


13. A is much younger than B as he is older than C. If the sum of the ages of B and C is 50 years, What is definitely the difference between B and A's age?

A. Data Inadequate

B. 1 year

C. 2 year

D. 3 year

x

 

Option: A

Explanation

A is much younger than B i.e) B-A

B is older than c i.e) B - C

From above 2 expressions (B - A) = (B - C) i.e) A = C

also sum of B and C is 50 years i.e) B + C = 50 years

i.e) B + A = 50 years(since A = C)

so, B - A cannot be determined

so, Data Inadequate

Answer


14. The total age of D and E is 12 years more than the total age of E and F. F is how many years younger than D?

A. 24 years

B. 12 years

C. 14 years

D. None of these

x

 

Option: B

Explanation

total age of D&E is 12 years more than total age of E&F

i.e) (D + E) - (E + F) = 12

then, D - F = 12

i.e) F is younger than D by 12 years

Answer


15. The present ages of three persons are in proportions 4:7:9. Eight years ago, the sum of their ages was 56. Find their present ages (in years).

A. 20, 35, 45

B. 8, 20, 28

C. 16, 28, 36

D. None of these

x

 

Option: C

Explanation

Consider their present ages be 4X, 7X and 9X years

8 years ago sum of their ages is 56

i.e. (4X - 8) + (7X - 8) + (9X - 8) = 56

20X = 80

X = 4

the present ages are (4 * 4), (7 * 4), and (9 * 4)

i.e. the present ages are16 years, 24 years and 36 years

Answer


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