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Question

Answer

Current age of Mrs Lim -> m

Current age of son -> (m – 20)

After 12 years,

Age of Mrs Lim -> (m + 12)

Age of her son -> (m – 20) + 12 = (m – 8)

Total age -> (m + 12) + (m – 8) = 2m + 4

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Thanks 

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In 12 years time,
Mrs lim ——- m + 12
son ——- (m – 20) + 12 = m – 8

m + 12 + m – 8 = 2m + 4

Ans : 2m + 4.

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