作者kockroach (假先知假使徒)
看板GRE_Verbal
标题Re: [计量] 请教几题(新东方)
时间Mon Jun 2 17:25:11 2008
※ 引述《cazzz (do or die)》之铭言:
: 今天做了新东方的数学快速突破 後面附的120题 突然觉得很惊慌
: ** What is the maximum number of cubes with sides of a
: length that could fit inside a cube of length 2s?
: (A) 8 (B) 16 (C) 32 (D) 64 (E) 128
: ANS:D
: **During a sale at an office supply store, for every box of paper clips
: purchased for 15 cents, a second box can be purchased for 4 cents. How
: many boxes of paper clip did Paul buy if he spent 91 cents on boxes of
: paper clips?
: (A) 6 (B) 7 (C) 8 (D) 9 (E) 10
: ANS:D
一次买两箱要 19 ,一次买一箱要 15,假设买了 x 个 "两箱",和 y 个 "一箱"
19x + 15y = 91
另外用列举法
x+y = 6/7/8/9/10
只有 x+y = 9 时有整数解,所以答案是 D
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