| X's age 3 yr ago was three times the present age of Y. At present, Z's age is twice the age of Y. Also Z is 12 yr younger than X. What is the present age of Z? |
A) 15 yr
B) 24 yr
C) 12 yr
D) 6 yr
E) 18 yr
Correct Answer: E
Solution :
| Let the present age of Y be t yr. |
| Then, present age of X is \[(3t+3).\] |
| Z's present age |
| Now, \[(3t+3)-2t=12\]\[\Rightarrow \]\[t=9\,yr\] |
| \[\therefore \] Present age of \[Z=18\,yr\] |
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