2. 外语
  3. To be considered grade AA, an egg must weigh between 75 and 90 grams, including the shell. Shells of grade AA eggs weigh between

To be considered grade AA, an egg must weigh between 75 and 90 grams, including the shell. Shells of grade AA eggs weigh between

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问题 To be considered grade AA, an egg must weigh between 75 and 90 grams, including the shell. Shells of grade AA eggs weigh between 3 and 5 grams. What is the smallest possible mass, in grams, of a 12-egg omelet, assuming that only grade AA eggs are used, the shells are all discarded, and no mass is lost in the cooking process?
选项 A、800
B、840
C、864
D、900
E、1,080
答案B
解析 The smallest omelet will result from 75-gram eggs with shells of 5 grams each, resulting in 70 grams per egg added to the omelet. 70 grams/egg×12 eggs=840 grams.
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