a) 15 years
b) 24 years
c) 12 years
d) 18 years
Answer: d
Explanation: Let the present age of Y be a years
Three years ago X’s age = 3a years
Then, present age of X is (3a + 3)
Z’s present age = 2a
Now, (3a + 3) – 2a = 12
a = 9 year
Present age of Z = 2a = 2 × 9 = 18 years
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