@mistahjfitness's answer to sarah's Primary 6 Maths Fractions Singapore question.

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@mistahjfitness
@mistahjfitness's answer
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No. Of extra chairs
= 7 x 24 -4 = 164

No. Of initial rows of 28 (because each row gave away 4 chairs)
= 164/4 = 41

No. Of chairs in the hall = 41 x 28 = 1148.