• question_answer A father is 5 times as old as his son. His son is 6 years old. After how many years, will the father be 4 times as old as his son? A)  2 years B)  5 years C)  6 years D)  4 years

[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.