SOLUTION: The sum of Rex's age and his son, Rodney's age is 50. Five years ago Rex was three times as old as Rodney. What are their ages now?

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Rex's age = x
Rodney = y

x+y=50
y=50-x (sub)

FIve years ago rex's age = x-5
Five years ago son's age = y-5

3(y-5)=x-5
3y-5=x-5
SUb
3(50-x-5)=x-5
135-3x=x-5
-4x=-140
x=35

y=50-35
y=15

Hence, Rex is 35 years old and his son is 15 years old.
PAul.