SOLUTION: Please help me solve this: A man is four times as old as his son. In five years' time he will be three times as old as his son. Find their present ages.

Question 991916: Please help me solve this:
A man is four times as old as his son. In five years' time he will be three times as old as his son. Find their present ages.
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
.
S=son's age; F=father's age=4S
.
F+5=3(S+5) . Substitute for F.
4S+5=3S+15
S=10
ANSWER 1: The son is 10 years old.
.
F=4S=4(10)=40
ANSWER 2: The father is 40 years old.
.
CHECK:
F+5=3(S+5)
40+5=3(10+5)
45=3(15)
45=45

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