Originally posted by THUDandBLUNDER
Mm - Ww + Wm - Mw
= M(m - w) + W(m - w)
= (M + W)(m - w)
But M - m = W - w
So m - w = M - W
Hence (M + W)(M - W) = 553 = 79*7
M = 43
W = 36
Yep that's it. Good work.
If you still dont get it.....
We have Mm-Ww+Wm-Mw = 553
Hence M(m-w)+W(m-w) = 553
Therefore (M + W)(m - w) = 553 = 7*79
Let x be the number of years between the wedding and the present day. Then m = M-x, w = W-x and m-w = M-x-W+x = M-W
Hence (M + W)(M - W) = 7*79
Then either M+W = 553 ( this is not reasonable as the couple would be too old)
or M+W = 79
Then M-W = 7. Adding these gives 2M = 79+7 = 86 and M=43
Then W = 43 - 7 = 36
Basically what TB said. You should be able to get it now Schumi.