SOLUTION: In 8 years, a boy will be three times as old as he was 4 years ago. Find his present age.

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Question 1057485: In 8 years, a boy will be three times as old as he was 4 years ago. Find his present age.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
In 8 years, a boy will be three times as old as he was 4 years ago.
Find his present age.
:
let a = his present age
Write an equation for exactly what it says
a + 8 = 3(a - 4)
a + 8 = 3a - 12
8 + 12 = 3a - a
20 = 2a
a = 20/2
a = 10 yrs is his present age
;
;
see if it works
10 + 8 = 3(10 - 4)
18 = 3(6)