Tuesday, 12 July 2011

Prelim Paper 1a Q14

Dear all,
Can you help me to solve the following problem. Provide me with the various methods you can come out with and record them in the form.
The average mass of a group of children is 20 kg. When a boy who weighs 28 kg joins the group, the average mass becomes 21 kg. How many children are there in the group now?

Mrs Mak

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