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 1057479: In 8 years, a boy will be three times as old as he was 4 years ago. Find his present age.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = his present age
+x+%2B+8+ = his age in 8 yrs
+x+-+4+ = his age 4 yrs ago
----------------------------
+x+%2B+8+=+3%2A%28+x+-+4+%29+
+x+%2B+8+=+3x+-+12+
+2x+=+20+
+x+=+10+
He is 10 now
--------------
check:
In 8 yrs he will be 18
4 yrs ago he was 6
+3%2A6+=+18+
OK