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.
a. 5,20
b. 6,24
c. 20,80
d. 10,40
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Robert's age = x | Robert's father's age = 4x
After 5 years, Robert's age = (x + 5)
After 5 years, Robert's father's age = 3(x + 5) = 3x + 15
We need to solve for x
4x + 5 = 3x + 15
4x - 3x = 15 - 5
x = 10
Robert's age = 10 years old
Robert's father's age = 10(4) = 40 years old
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