A father is 5 times as old as his son. His son is 6 year old. After how many years, will the father be 4 times as old as his son ?
Son's age = 6 years
=> Father's age = $$5\times6=30$$ years
Let after $$x$$ years, father will be four times as old as his son.
=> $$(30+x)=4(6+x)$$
=> $$30+x=24+4x$$
=> $$4x-x=30-24$$
=> $$3x=6$$
=> $$x=\frac{6}{3}=2$$
$$\therefore$$ After 2 years, father will be four times as old as his son.
=> Ans - (A)
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