Posted by wan on Sunday, September 16, 2012 at 1:26am.
Let my age now be A, and let Mum's age now be M. Then we know that:
A = M/3, so 3A = M
A-8 = (M-8)/5, so 5A-40 = M-8
but M = 3A, so 5A-40 = 3A-8
so 2A = 40-8 = 32
so A = 16
so M = 48.
Check it: A is one-third of M, and eight years ago I would have been 8 and Mum would have been 40.
But I want to know what Mum's age will be 8 years from now, so that will be 48 + 8 = 56.
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