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?

Maths  Steve, Monday, November 12, 2012 at 9:52am
at present, their age total is m + (m20) = 2m20
In 12 years, they will each be 12 years older, so add 24 to the total: 2m+4
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