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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 -

    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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