Question

Solve 1 and 3 please​

Answer 1

Answer:

Let Robert’s age be x years.

Then Robert’s father’s age = 4x

After 5 years, Robert’s age = x + 5

Father’s age = 4x + 5

According to the question,

4x + 5 = 3(x + 5)

⇒ 4x + 5 = 3x + 15

⇒ 4x - 3x = 15 - 5

⇒ x = 10

⇒ 4x = 4 × 10 = 40