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January 30, 2015

January 30, 2015

Posted by **wan** on Sunday, September 16, 2012 at 1:26am.

- math -
**David Q/R**, Sunday, September 16, 2012 at 2:04pmLet 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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