Aptitude - Questions & Answers

Ages - Online Quiz

Quiz

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.

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.

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 :

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?

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 - Prabhakar is 15 years older than Navin and Navin is 25 years younger than Ashok. Which of the following represents the difference between the ages of Ashok and Prabhakar?

Answer : D

Explanation

According to question,
P = N + 15
A = N + 25

A - P = (N + 25) - (N + 15) = 10 years

Q 5 - 10 year hence, 5:3 is the ratio of mother and daughter but 10 year before 3:1 would be the ratio of mother and daughter . Find out the mother and daughter present age of ratio?

Answer : A

Explanation

Let mother age 10 year hence be 5x years and daughter age be 3x years.
mother present age =( 5x-10) year, daughter present age = (3x-10) year
(5x-10)-10/(3x-10)-10 =3/1 ⇒ 5x-20/3x-20 = 3/1 ⇒ (5x-20) =3(3x-20) ⇒ 4x= 40 ⇒ x =10
Ratio of present age of mother and daughter =   (3*10-10)/(5*10-10) =20/40 = 1/2  =1:2

Q 6 - What should be the present age of two person if 5:7 is the present age ratio of two person and 3:5 was the age ratio before the period of 16 year?

Answer : C

Explanation

If the present age of two persons are 5x years and 7x years.
5x-16/ 7x-16 =3/5 ⇒ 5(5x-16) =3(7x-16)
⇒ 4x= (80-48) = 32 ⇒ x =8
Hence, their present ages are 40 years and 56 years.

Q 7 - A mother have 7 times in the comparison of her daughter at the time of 1 year ago . At the present time mother age is equal to the square of her son . What should be the time age of mother?

Answer : B

Explanation

Let the present age of the son be x years.
Man present age  =7(x-1)+1 years =  (7x-6 ) yrs.
7x-6 = x² ⇒ x²-7x+6 = 0 ⇒ (x-6)(x-1) =0 ⇒ x =6 or x =1
∴ present age of men = (7*6-6) = 36 yrs.

Q 8 - Yusuf is as much younger to ajay as he is older to pawan , if 48 year is the sum of ajay and pawan then what should be the present age of yusuf?

A - 20 years

B - 24 years

C - 30 years

D - cannot be determined

Answer : B

Explanation

Given   A-Y = Y-P ⇒ A+P = 2Y
Also A+P = 48 Year . so,  2j = 48 ⇒ y = 24
Hence, yusuf  is 24 year old.

Q 9 - What should be the present age of A,B and C who have the present age in the proportion of 10 :11:12. 150 was the sum of the ages of all before the period of 5 years.

Answer : D

Explanation

If the present age  of A,B and C be 10 x, 11x and 12x  years.
Sum of their ages now = (150+ 5*3) =165 years.
∴ 10x+11x+12x = 165 ⇒ 33 x = 165 ⇒ x = 5
So, their  ages are 50, 55 and 60  years.

Q 10 - Here 3:2 is the present age ratio between raj and john. If raj was 6 year older in the comparisoin of john after the priod of 4 years. What should be the present age ratio of john?

Answer : B

Explanation

Let raj age = 3x years. Then john age = 2x years.
(3x-4) = 2x-4 +6 ⇒ x =6
Present age of john = (2*6) = 12 years

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