AMC8 1999
AMC8 1999 · Q18
AMC8 1999 · Q18. It mainly tests Percent, Rates (speed).
They learn that a big concert is scheduled for the same night and attendance will be down 25%. How many recipes of cookies should they make for their smaller party? [same context]
他们得知当晚有大型音乐会，出席人数将减少 25%。他们为人数减少的派对应该做多少配方的饼干？[相同背景]
(A)
6
6
(B)
8
8
(C)
9
9
(D)
10
10
(E)
11
11
Answer
Correct choice: (E)
正确答案：（E）
Solution
Answer (E): The 108(0.75) = 81 students need 2 cookies each so 162 cookies are to be baked. Since 162 ÷ 15 = 10.8, Walter and Gretel must bake 11 recipes. A few leftovers are a good thing!
答案（E）：$108(0.75)=81$ 名学生每人需要 2 块饼干，因此需要烤 $162$ 块饼干。因为 $162 \div 15 = 10.8$，Walter 和 Gretel 必须烤 11 份配方。剩下一些是好事！
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