Explanation:
2 cups of sugar mix with 7 cups of water.
so, 2/2 = 1 cup of sugar mixes therefore with 7/2 = 3.5 cups of water.
and 5 cups of sugar (= 5×1 cups) mix with 5×3.5 = 17.5 cups of water.
not 21. not 28. it is 17.5 cups of water !
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