SOLUTION: the present age of three persons in proportions 4:7:9 Eight years ago the sum of their age is 56.find their present age in years

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Question 839768: the present age of three persons in proportions 4:7:9 Eight years ago the sum of their age is 56.find their present age in years
Answer by Fombitz(32388) About Me  (Show Source):
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Now they are 4x,7x, and 9x.
Eight years ago they were, 4x-8,7x-8, and 9x-8
4x-8%2B7x-8%2B9x-8=56
20x-24=56
20x=80
x=4
So they are 16, 28, and 36.