SOLUTION: Jack is 4 times as old as Lacy. 3 years ago the sum of their ages was 24. How old are they now?

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Question 979979: Jack is 4 times as old as Lacy. 3 years ago the sum of their ages was 24. How old are they now?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
(1) +J+=+4L+
(2) +j+-+3+%2B+L+-+3+=+24+
-------------------------
Substitute (1) into (2)
(2) +4L+-+3+%2B+L+-+3+=+24+
(2) +5L+=+24+%2B+6+
(2) +5L+=+30+
(2) +L+=+6+
and
(1) +J+=+4L+
(1) +J+=+4%2A6+
(1) +J+=+24+
--------------------
Jack is 24
Lacy is 6
------------------
check:
(2) +j+-+3+%2B+L+-+3+=+24+
(2) +24+-+3+%2B+6+-+3+=+24+
(2) +30+-+6+=+24+
(2) +24+=+24+
OK