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
Let present age of Y =a
Present age of X = 3a+3
Present age of Z = 2a
According to question,
3a+3-2a = 12
a=12-3=9
∴Z's present age = 2 × 9 =18 years
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