Question

At present a father is 40 years older than his son. Twenty years ago, he was five times older than his son. What is the present age of the son?

Answer 1

Let the father's present age be 'x',

Then, the son's present age will be 'x - 40'

According To Question, x - 20 = 5 (x - 40)      ⇒ (This is the equation.)

                                   or x - 20 = 5x - 200

                                   or 5x - x = - 20 + 200   ⇒ (Putting like terms together.)

                                   or 4x = 180

                                   or x = $\frac{180}{4}$

                                   or x = 45

So, the son's present age is x - 40 = 45 - 40 = 5 years.

Please mark my answer the brainliest.