SOLUTION: Ben is 3 times as old as jin now. In 2 year time Ben will be twice as old as jin. How old is jin now.

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Question 1033210: Ben is 3 times as old as jin now. In 2 year time Ben will be twice as old as jin. How old is jin now.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +b+ = Ben's age now
Let +j+ = Jin's age now
--------------------------
(1) +b+=+3j+
(2) +b+%2B+2+=+2%2A%28+j+%2B+2+%29+
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Substitute (1) into (2)
(2) +3j+%2B+2+=+2%2A%28+j+%2B+2+%29+
(2) +3j+%2B+2+=+2j+%2B+4+
(2) +j+=+2+
Jin is 2 now
----------------
check:
(1) +b+=+3%2A2+
(1) +b+=+6+
and
(2) +b+%2B+2+=+2%2A%28+j+%2B+2+%29+
(2) +6+%2B+2+=+2%2A%28+2+%2B+2+%29+
(2) +8+=+2%2A4+
(2) +8+=+8+
OK