Solve 1 and 3 please
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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
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