A) 4 yr
B) 6 yr
C) 7 yr
D) 8 yr
Correct Answer: C
Solution :
Let Ramu's present age be x year. Then, \[(x-5)\times (x+7)=28\] \[\Rightarrow \]\[{{x}^{2}}+2x-35=28\] \[\Rightarrow \]\[{{x}^{2}}+2x-63=0\] \[\Rightarrow \]\[(x+9)(x-7)=0\]\[\Rightarrow \]\[x=7\] \[\therefore \] Ramu's present age is 7 yr.You need to login to perform this action.
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