A) 10 yr
B) 20 yr
C) 37 yr
D) 5 yr
Correct Answer: A
Solution :
Let x year ago the ratio of their ages was 3 : 5, \[\therefore \]According to the question, \[\frac{40-x}{60-x}=\frac{3}{5}\] \[\Rightarrow \] \[200-5x=180-3x\] \[\Rightarrow \] \[2x=20\] \[\therefore \] \[x=10\,\,yr\]You need to login to perform this action.
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