Let Morgan = X
Then Mary = 5X ( 5 times as old).
The sum is 72, so 5x +x = 72
5x +x = 6x:
6x = 72
Divide both sides by 6:
x = 72 / 6
x = 12
Morgan is 12 years old.
Mary is 5(12) = 60 years old.
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