问题 单项选择题

A breakfast that consists of 1 ounce of corn puffs and 8 ounces of fruit X provides 257 calories. When 8 ounces of fruit Y is substituted for the 8 ounces of fruit X, the total number of calories is reduced to 185. If fruit X provides 1.8 times as many calories as fruit Y, how many calories does 8 ounces of fruit Y alone provide ?()

A.11.25

B.72

C.90

D.95

E.129.6

答案

参考答案:C

解析:

设8盎斯的水果Y单独能供给x卡的热量,则8盎斯的水果X单独能供给1.8x卡的热量,根据题意可得:

1.8x-x=257-185

→x=90

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单项选择题