The age of a man is 4 times that of his son. Five years ago, the man was 7 times as old as his son at that time. What is the present age of the man?

Correct option is B

Given
Man's age = 4 × Son's age
Condition 5 years ago: Man - 5 = 7 × (Son - 5)
Solution
4x - 5 = 7(x - 5)
4x - 5 = 7x - 35
​$$3x = 30 \Rightarrow x = 10$$​​
Man's age =$$4 \times 10$$​= 40 years

Final Answer
So the correct answer is (b)