Robert’s father is 4 times as old as Robert. After 5 years, father will be three times as old as Robert. Find their present ages.
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15
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
Robert’s present age is 10 years and that of his father’s age = 40 years.
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Answered by
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Let, the age of the Robert be 'x' says
Age of the Roberts father =4x
After 5 years the age of the Robert =x+5
And his father's age = 4x+5
Acc to the question
➡4️X+5=3(x+5)
➡️4X+5=3x+15
➡️4X-3x=15-5
➡️X=10
Present age of the Robert =x = 10years
And his father's age =4x=4(10)=40years
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