SOLUTION: Chad and his grandfather both had birthdays last week. The sum of their ages is 120. His grandfather's age is 3 times Chef's age. How old is Chad?

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Question 1108146: Chad and his grandfather both had birthdays last week. The sum of their ages is 120. His grandfather's age is 3 times Chef's age. How old is Chad?
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
system%28c%2Bg=120%2Cg=3c%29

Assumption is you meant "Chad", and not "Chef".

Simple substitution,
c%2B3c=120
4c=120
c=120%2F4
c=30