math
posted by Thanh .
Adam is 3 times as old as Cynthia and Fred is 16 years younger than Adam. One year ago, Adam's age was twice the sum of Cynthia's and Fred's age. Find their present age.
I have a answer already but I still not get it,please help me out with answer clearly.Thank you so much.

Adam is 3 times as old as Cynthia or A = 3C.
Fred is 16 years younger than Adam or F = A  16.
One year ago, Adam's age was twice the sum of Cynthia's and Fred's age or A  1 = 2(C + F).
Find their present age.
Making the appropriate substitutions and solving yields C = 11, A = 33 and F = 17.
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