AC Lim's answer to Mag's Primary 5 Maths Fractions Singapore question.

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AC Lim
Ac Lim's answer
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Remaining ⅗ = ¼ of total
Remaining ⅗ = ³/12 of total.
Therefore,
7u = 518
1u = 74
Total spend = 1- 3/12 = 9/12
9u = 9×74 = $666
Hope this helps