2006 AMC 12A 第 5 题

先试着解答 2006 AMC 12A 第 5 题,然后核对你的答案与精心整理的解答,解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 2006 AMC 12A 解答,或核对答案。

所有题目均经美国数学协会(MAA)官方合法授权使用。

5.

Doug 和 Dave 分一张有 88 片等大披萨。Doug 想要原味披萨,但 Dave 想要半张披萨加凤尾鱼。原味披萨价格为 $8\$8,半张加凤尾鱼需要额外 $2\$2。Dave 吃了所有凤尾鱼披萨片和一片原味披萨。Doug 吃了剩下的部分。两人各自支付自己吃掉的部分。Dave 比 Doug 多付多少美元?
Doug and Dave shared a pizza with 88 equally-sized slices. Doug wanted a plain pizza, but Dave wanted anchovies on half of the pizza. The cost of a plain pizza was $8,\$8, and there was an additional cost of $2\$2 for putting anchovies on one half. Dave ate all the slices of anchovy pizza and one plain slice. Doug ate the remainder. Each then paid for what he had eaten. How many more dollars did Dave pay than Doug?
11
22
33
44
55
答案:D
知识点:分数钱币
小提示:
原味披萨 $8\$8 有 88 片,所以每片原味披萨 $1\$1。
The plain pizza is $8\$8 for 88 slices, so each plain slice costs $1\$1
大提示:
把 $2\$2 的凤尾鱼附加费分摊到 44 片凤尾鱼披萨上,再计算每个人的费用。
Spread the $2\$2 anchovy surcharge over the 44 anchovy slices, then total each person’s cost
解答:
每片原味披萨花费 $1\$1。$2\$2 的凤尾鱼费用分摊到 44 片凤尾鱼披萨上,每片多 $0.50\$0.50,所以每片凤尾鱼披萨花费 $1.50\$1.50。
Dave 吃了 44 片凤尾鱼披萨和 11 片原味披萨:4⋅1.5+1=$74\cdot 1.5 + 1 = \$7。Doug 吃了剩下的 33 片原味披萨:$3\$3。Dave 多付 7−3=$47 - 3 = \$4。
因此,正确答案是 D。
Each plain slice costs $1.\$1. The $2\$2 anchovy charge is spread over the 44 anchovy slices, adding $0.50\$0.50 each, so an anchovy slice costs $1.50.\$1.50.
Dave ate 44 anchovy slices and 11 plain slice: 4⋅1.5+1=$7.4\cdot 1.5 + 1 = \$7. Doug ate the 33 remaining plain slices: $3.\$3. Dave paid 7−3=$47 - 3 = \$4 more.
Thus, the correct answer is D.
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