SOLUTION: the sum of the ages of elli and dan is 56.four years ago elli was 3 times as old as dan.how old are they now?give the solution:

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Question 925199: the sum of the ages of elli and dan is 56.four years ago elli was 3 times as old as dan.how old are they now?give the solution:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
(1) +e+%2B+d+=+56+
(2) +e+-+4++=+3%2A%28+d+-+4+%29+
---------------------
(2) +e+-+4+=+3d+-+12+
(2) +-e+%2B+3d+=+8+
Add (1) and (2)
(1) +e+%2B+d+=+56+
(2) +-e+%2B+3d+=+8+
--------------------
+4d+=+64+
+d+=+16+
and, since
(1) +e+%2B+d+=+56+
(1) +e+%2B+16+=+56+
(1) +e+=+40+
--------------
Dan is 16
Eli is 40
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check:
(2) +e+-+4++=+3%2A%28+d+-+4+%29+
(2) +40+-+4++=+3%2A%28+16+-+4+%29+
(2) +36+=+3%2A12+
(2) +36+=+36+
OK