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题目材料：
If the total amount residential energy usage for water heating and refrigeration combined is r energy units, then the total annual residential energy usage for the remaining six categories combined is how many energy units?
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A.0.24r
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B.0.76r
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C.1.24r
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D.$$\frac{0.24r}{0.76}$$
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E.$$\frac{0.76r}{0.24}$$
E显示答案
