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A Now and Then(Age) Problem

Ann is fifteen years older than Joe. Ten years from now, Ann will be twice as old as Joe. How old is each now?

--------------------------------     --------------------------------
| now |unknown|factor|term|age |     |then |unknown|factor|term|age |
--------------------------------     --------------------------------
| ann |       |   1  | 15 |    |     | ann |       |   2  |    |    |
--------------------------------     --------------------------------
| joe |       |   1  |  0 |    |     | joe |       |   1  |    |    |
--------------------------------     --------------------------------
unknown$ = (ann's now term + 10 - ann's future factor X 10)/
           (ann's future factor - ann's now factor);
for now:
    age$ = unknown + term$.
END.