A) 12
B) 15
C) 18
D) 20
Correct Answer: B
Solution :
Let son's age be x yr. Then, father's age \[=(3x)\,yr\] Five years ago, father's age \[=(3x-5)\,yr\] And son's age \[=(x-5)\,yr\] So, \[3x-5=4(x-5)\] \[\Rightarrow \] \[3x-5=4x-20\] \[\Rightarrow \] \[x=15\]You need to login to perform this action.
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