Maths
posted by Jae .
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?

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