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This is a Part Whole question.

We shall start with the Ratio.

   Snack Biscuit  water  Total
Quantity  1u 3u 3u – 3 7u – 3

 

7u – 3 = 5.40

7u = 5.40 + 3 = 8.40

1u = 8.40 ÷ 7 = 1.20

3u = 3 × 1.20 = 3.60

3.60 – 3 = $0.60

 

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