SOLUTION: The sum of the ages of Joe and Jim is 90. Six years from now, Joe will be twice Jim's age. Find Joe's present age.

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Question 290970: The sum of the ages of Joe and Jim is 90. Six years from now, Joe will be twice Jim's age. Find Joe's present age.
Answer by Deina(147) About Me  (Show Source):
You can put this solution on YOUR website!

Let:
J = Joe
M = Jim
J + M = 90
M = 90 - J
+J+%2B+6+=+cross%282%28M+%2B+6%29%29+=+2M+%2B+12++ Substitute (90 - J) for M
+J+=+cross%282%2890+-+J%29+%2B+6%29+=+180+-+2J+%2B+6+
+J+%2B+2J+=+186+

+3J%2F3+=+186%2F3+
J = 62
90 - 62 = 38

Joe = 62, Jim = 38
and bob's your uncle!