DEREK NG's answer to Mugilan's Primary 5 Maths Whole Numbers Singapore question.

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DEREK NG
Derek Ng's answer
20 answers (Tutor Details)
1st
You can check back the answer by seeing if Jim is donating 4 times of Roy.

Jim = 110 - 30 = 80
Roy = 50 - 30 = 20

80÷20=4

Proves that Jim's donation is 4 times of Roy, when Siti is donating $30