SOLUTION: Marks age now if he is seven-ninths of what it will be 18 yrs from now

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Question 903965: Marks age now if he is seven-ninths of what it will be 18 yrs from now
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = Mark's age now
+x+=+%28+7%2F9+%29%2A%28+x+%2B+18+%29+
+9x+=+7%2A%28+x+%2B+18+%29+
+9x+=+7x+%2B+126+
+2x+=+126+
+x+=+63+
Mark is 63 now
check:
In +18+ yrs, he will be:
+63+%2B+18+=+81+
+63+=+%28+7%2F9+%29%2A%28+63+%2B+18+%29+
+63+=+%28+7%2F9+%29%2A81+
+63+=+7%2A9+
+63+=+63+
OK