Ages - Online Quiz


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Following quiz provides Multiple Choice Questions (MCQs) related to Ages. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Q 1 - The average age of 80 girls was 20 years, the average age of 20 of them was 22 years and that of another 20 was 24 years. Find the average age of the remaining girls.

A - 17 years

B - 19 years

C - 21 years

D - 15 years

Answer : A

Explanation

Total age of remaining 40 girls = (80*20 - 20*22 ? 20*24)
= (1600-440-480)
= 680 years
Therefore average age for the 40 girls = 680/40 = 17 years

Q 2 - The average age of 30 boys in a class is 15 years. One boy aged 20 years, left the class, but two new boys came in his place whose ages differ by 5 years. If the average age of all the boys now in the class still remains 15 years, the age of the younger newcomer is :

A - 20 years

B - 15 years

C - 10 years

D - 8 years

Answer : B

Explanation

Let the age of younger boy be x years.
Therefore age of older boy = (x+5) years
Then, total age of 30 boys = 30*15 = 450 years
Total age of 31 boys after two newcomers join = 450 - 20 +x + x +5
= 435 + 2x

From the question, 435 + 2x = 31 * 15
Or, 2x = 465 - 435
Or, x = 15 years

Q 3 - Present ages of Radha and Sudha are in the ratio of 7:9 respectively. Five years ago ratio of their ages was 3:4. What will be Sudha?s age after 3 years from now?

A - 48 years

B - 42 years

C - 43 years

D - 38 years

Answer : A

Explanation

Let the present ages of Radha and Sudha be x years and y tears respectively.
Five years ago, Radha's age = (x - 5) years
Sudha's age = (y - 5) years
According to the question,
x/y = 7/9
Or,  x= 7y/9  ... (i)
Also, (x - 5) / (y - 5) = 3/4
Or, 4x - 20 = 3y - 15
Or, 4x - 3y = 5 ...(ii)
Putting the value of x from equ (i) into equ (ii),
(4*7y)/9 - 3y = 5
Or, 28y - 27y = 45
Or, y = 45
Therefore, Sudha's age after 3 years = 45 + 3 = 48 years

Q 4 - If 8 :15 is the ratio of sunil and tarun ages than the ratio and tarun change after the period of 9 year and become 11:18 . Find out the age difference between sunil and tarun ?

A - 20 years

B - 21 years

C - 24 years

D - 33 years

Answer : B

Explanation

Let sunil age = 8 year and tarun age is = 15 x years.
8x+9 / 15x+9 =11/18  ⇒ 18 (8x+9) = 11(15x+9)
⇒  144x +162 = 165x +99 ⇒21x = 63 ⇒ x =3
Difference between the ages = (15x-8x)= 45-24 = 21 years

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?

A - 1:4

B - 2:3

C - 3:5

D - 5:6

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 the age of a mother is 3 times in the comparison of her daughter before the period of 10 year . 10 year later from the present date , the mother age would be 2 times of her daughter. In that situation what should be the age ratio of them at the present time?

A - 13:4

B - 9:2

C - 7:3

D - 5:2

Answer : C

Explanation

If the x year is the present age of her daughter.
Mother age 10 year ago = 3(x-10) = (3x-30) year
Present age of the mother = ( 3x-30+10) = (3x-20) year
After 10 year age of the mother = (3x-20 +10) = (3x-10) year
Son age after the period of 10 year = (x+10) year
∴  (3x-10) = 2(x+10) ⇒ x = 30
Mother present age = (3x-20) year = 70 years.
Daughter present age = 30 years.
Required ratio =  70: 30 = 7:3

Q 7 - The product of Ram age 5 year ago with his age 7 years later is 28 . What should be the present age of mr. Ram ?

A - 4 years

B - 6 years

C - 7 years

D - 8 years

Answer : C

Explanation

If present age of ram is x years. then
(x-5)*(x+7) = 28 ⇒ x2 +2x-35 = 28 ⇒ x2+2x-63 =0
⇒ (x+9) (x-7) = 0 ⇒ x =7
∴ 7 years is the present age of  ram.

Q 8 - A mother was 4 times older in the comparison of her daughter before the period of 10 year. The mother age would be double in the comparison of her daughter after 10 year. What should be the present age of the daughter ?

A - 5 years

B - 10 years

C - 20 years

D - 30 years

Answer : C

Explanation

Let daughter age 10 year ago be x years.
Mother age 10 years ago = 4x years
2(x+20) = (4x+20) ⇒ 2x = 20 ⇒ x =10
Present age of  daughter = (x+10) = 20 years.

Q 9 - Ajay is 2 years older than brij but brij have double age in the comparison of Chaman . 27 years is the total age all of three. What should be the present age of brij?

A - 7 years

B - 8 years

C - 9 years

D - 10 years

Answer : D

Explanation

If chaman age be x years . then brij age = 2x years , ajay  age =( 2x+2)
∴  2x+2+2x+x =27 ⇒  5x = 25 ⇒ x =5
The age of brij = 10 years.

Q 10 - 15 year hence, a man will be just 4 times as old as he was 15 years ago . His present age is

A - 5 years

B - 15 years

C - 20 years

D - 25 years

Answer : A

Explanation

Let the present age of the men  be x years. then
(x+15) = 4(x-15) ⇒ 3x= 75 ⇒ x =25
Hence, the present age of the man is 25 years.


aptitude_ages.htm

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