A) 12 years
B) 15 years
C) 18 years
D) 20 years
Correct Answer: B
Solution :
(b): Let age on today = x \[\Rightarrow (x+12)=9(x-12)\] \[\Rightarrow 12+108=8x\] \[\Rightarrow x=\frac{120}{8}=15\]You need to login to perform this action.
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