Posted by **Jae** on Monday, November 12, 2012 at 5:04am.

Mrs Lim is m years old. She gave birth to her son when she was 20 years old. What will their total age be in 12 years' time?

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**Steve**, Monday, November 12, 2012 at 9:52am
at present, their age total is m + (m-20) = 2m-20

In 12 years, they will each be 12 years older, so add 24 to the total: 2m+4

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