X rsquo s age 3 years ago was three times the present age of Y At present Z rsquo s age is twice the...........

Quantitative Aptitude ( CCS) Average

X’s age 3 years ago was three times the present age of Y. At present, Z’s age is twice the age of Y. Also Z is 12 years younger than X. What is the present age of Z ?

15 years

24 years

12 years

18 years

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Explanation:

Y’s present age = y year (let)
∴ X’s present age = (3y + 3) years
∴ Z’s present age = 2y years
According to the question,
3y + 3 – 2y = 12
y + 3 = 12
= y = 12 – 3 = 9 years
∴ Z’s present age = 2y
= 2 × 9 = 18 year