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February 28, 2015

February 28, 2015

Posted by **Jessica** on Friday, October 21, 2011 at 1:11am.

- Mathematics -
**drwls**, Friday, October 21, 2011 at 2:01amLet x be his present age.

x + 11 = (1/2)(x - 13)^2

You could solve that quadratic equation or use trial and error.

Try x = 21

does 32 = (1/2)*8^2 ?

Looks good to me.

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