A) 2 years
B) 5 years
C) 6 years
D) 4 years
Correct Answer: A
Solution :[a] Son's age=6 yrs. Father's age=30 yrs. Let 'x' be the yr. after which father will be 4 times as old as his son. According to question \[30+x=4\left( 6+x \right)=30+x=24+4x\Rightarrow \,\,\,6=3x.\]\[x=2.\] Hence, require year is 2 yrs.
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