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. substitution method
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Let the age of the son = X
Therefore, father's age =4X as given
But the sum of the ages of the son and father =50
:
X +4X = 50 we call this equation 1
solving for X in equation 1
X+4X = 50
5X= 50, Divide both sides by 5
5X÷5= 50÷5
X=10
The son's age X = 10
The father's age is 4X= 4x10= 40
Checking. ..
10+40=50
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