The age of arvind's father is 4 times of his age. If 5 years ago, father's age was 7 times of the age of his son at that time. What is arvind's father's present age?

35 years
40 years
70 years
84 years

Correct Answer: 40 years

Explanation:

Let Arvind's present age be x years
Then, his father's present age = 4x years
∵ (4x - 5) = 7(x - 5)
⇒ 3x = 30
∴ x = 10
Hence, Arvind's father's age is 40 years.

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