Maths Olympiad Prep

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, 2016

Algebra Difficulty 1.0 Junior Prove it Canada

Raisins are sold by the scoop, cup, jar, basket, or tub in the following proportions:

5 scoops of raisins fill 1 jar, 3 scoops of raisins fill 1 cup, 5 baskets of raisins fill 2 tubs, and 30 jars of raisins fill 1 tub.

Figure 0 How many tubs of raisins fill 30 baskets?
Figure 1 How many cups of raisins fill 6 jars?
Figure 2 Determine how many cups of raisins fill 1 basket.

Solution

Since 5 baskets of raisins fill 2 tubs, then 5×6=305\times6=30 baskets of raisins fill 2×6=122\times6=12 tubs. Therefore, 12 tubs of raisins fill 30 baskets. Since 5 scoops of raisins fill 1 jar, then 5×6=305\times6=30 scoops of raisins fill 1×6=61\times6=6 jars. Since 3 scoops of raisins fill 1 cup, then 3×10=303\times10=30 scoops of raisins fill 1×10=101\times10=10 cups. Since 30 scoops fill 6 jars, and 30 scoops fill 10 cups, then 10 cups of raisins fill 6 jars. Solution 1 From part (b), we know that 10 cups of raisins fill 6 jars. Thus, 10×5=5010\times5=50 cups of raisins fill 6×5=306\times5=30 jars. Since 30 jars of raisins fill 1 tub, then 50 cups of raisins fill 1 tub, or 50×2=10050\times2=100 cups of raisins fill 1×2=21\times2=2 tubs. Since 2 tubs of raisins fill 5 baskets, then 100 cups of raisins fill 5 baskets. This tells us that 100÷5=20100\div5=20 cups of raisins fill 5÷5=15\div5=1 basket. Solution 2 Since 5 baskets fill 2 tubs, then 25\frac{2}{5} tubs fill 1 basket. Since 30 jars of raisins fill 1 tub, then 25×30=12\frac{2}{5} \times 30 = 12 jars of raisins fill 25\frac{2}{5} tubs and so fill 1 basket. Since 5 scoops of raisins fill 1 jar, then 12×5=6012 \times 5 = 60 scoops of raisins fill 12 jars and so fill 1 basket. Since 3 scoops of raisins fill 1 cup, then 20×1=2020 \times 1 = 20 cups fill 20×3=6020 \times 3 = 60 scoops and so fill 1 basket.

Therefore, 20 cups of raisins fill 1 basket.

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