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Ages - Online Quiz

Answer : C

Explanation

Supervisor?s age = 32 + 6 = 38 years

Q 2 - There were 24 students in a class. One of them, who was 18 years old, left the class and his place was filled up by a new comer. If the average of the class thereby was lowered by 1 month, the age of the newcomer is -

Answer : B

Explanation

Total age decreased = 24 * 1 months = 24 months or 2 years.
Therefore, age of the new comer = 18 ? 2 = 16 years

Q 3 - One year ago the ratio of Yamini?s and Gamini?s ages was 6 : 7 respectively. Four years hence this ratio would become 7 : 8. How old is Gamini?

Answer : D

Explanation

Let one year ago the ages of Yamini and Gamini be 6x and 7x years respectively.

Therefore, present ages will be 6x + 1 and 7x + 1 years respectively.

Now four years hence,

(6x + 1 + 4) / (7x + 1 + 4)  = 7/8
Or, (6x + 5)  / (7x + 5) = 7/8
Or, 49x + 35 = 48x + 40
Or, X = 40 - 35 = 5 

Hence Gamini's present age = 7x + 1  = 7*5 + 1 = 36 years

Q 4 - A man five times older in the comparison of his son in the present time but before the period of 5 year the father age in the comparison of his son was 10 times older . Find out present age of the father?

Answer : A

Explanation

Let the present age of the son be x year. Then , present age of the man  = 5x year
∴  (5x-5 = 10 (x-5) ⇒ 5x= 45 ⇒ x = 9
Age at the present time of the father is = (5*9) = 45 year

Q 5 - If 1:2 is the present age ratio of two girls. But 1:3 age ratio of girls was 5 year ago . In that case find out the ratio of age after the period of 5 year?

Answer : C

Explanation

If the present age of two girls is x and 2x years. Then,
x-5/ 2x-5 = 1/3 ⇒ 3(x-5) =(2x-5) ⇒ x =10
5 year after their age ratio will be = x+5/ 2x+5 = 10+5/20+5 = 15/25 = 3/5= 3:5

Q 6 - If 6 year is the difference of age of two boys ram and shyam at the present time. After the period of 4 year, the ratio of their age would be 3:4 . find out the shyam age at the present time?

Answer : C

Explanation

Let  x year is the ram present age then shyam present age will be (x+6)
X+4/ (x+6+4) = 3/4 = x+4/ x+10 = 3/4  ⇒ 4(x+4) = 3(x+10) ⇒ x = 14.
Hence , it proves that the present age of shyam = (14+6) = 20 year

Q 7 - If 4:1 is the ratio between mother and daughter and the sum of their age is 196. What should be the age ratio between mother and daughter after the period of 5 year?

Answer : C

Explanation

Let mother age be4 x year and her daughter age is x year.
4x*x = 196 ⇒ x² = 49 ⇒ x = 7
Present age of mother is 7*4 = 28 year and son present age = 7 years.
Required ratio = (28+5) : (7+5) = 33 : 12   = 11 : 4

Q 8 - If 45 year is the sum of mother and her son age. 5 year agoThe product of mother and son ages was 4 times in the comparison of mother present age. Find out the present age of mother and her son?

Answer : B

Explanation

Let mother present age be x yrs and son  age be  (45-x) yrs.
(x-5) (45-x-5) = 4(x-5) ⇒( x-5) ( 40-x) = 4( x-5) ⇒ 40-x =4 ⇒ x =36
Present age of mother is 36 yrs. And age of son is 9 yrs.

Q 9 - The sum of the ages of five girl born at the interval of 3 years each is 50 years. Find out the youngest girl age?

Answer : A

Explanation

Let the youngest girl age be x years. Then,
X+(x+3) +( x+6) +(x+9) +(x+12) = 50
⇒5x+30 = 50  ⇒ 5x= 20 ⇒ x =4
Required age = 4 yrs.

Q 10 - Ajit age after 15 years will be 5 times his age 5 years back . what is the present age of ajit ?

Answer : B

Explanation

Let the present age of ajit be x years.
(x+15) = 5(x-5) ⇒ x+15 = 5x-25 ⇒ 4x= 40 =. X = 10

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