Tok Ee Hean's answer to Chelsea's Primary 4 Maths question.
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You have to know that the pail has mass initially. The question is asking for mass of sand initially only. Just take the mass of extra sand added and find the mass per unit as shown in the model. Just multiply by 3 to find mass of sand at first as it was 3/8 filled.
Date Posted:
6 years ago
Thanks a lot （＾◇＾）
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