标题: 急求！！！！数学疑问 [打印本页] 作者: ycenyidol 时间: 2012-3-9 19:50 标题: 急求！！！！数学疑问 以下是prep数学： 96. According to the directions on a can of frozen orange juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice.How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?
(A)25
(B)34
(C)50
(D)67
(E)100
143. In a survey of students, each student selected from a list of 12 songs the 2 songs that the student liked best.If each song was selected 4 times, how many students were surveyed?
(A) 96
(B) 48
(C) 32
(D) 24
(E) 18
80. If x and y are positive integers such that x = 8y + 12, what is the greatest common divisor of x and y ?
(1) x = 12u, where u is an integer.
(2) y = 12z, where z is an integer.
197. The integers m and p are such that 2 < m < p and m is not a factor of p.If r is the remainder when p is divided by m, is r > 1 ?
(1)The greatest common factor of m and p is 2.
(2)The least common multiple of m and p is 30.
以下是2012.3月份寂静中的问题
3. V1. 50个人，20%没有电脑，18%没有手机，6% don't have a laptop or don't have a cellphone.问有多少个人既没有手机也没有电脑 (cflwj)
V2. 我遇到变体,求的既有电脑也有手机.(TSFyfy)
答案：1人只有电脑，2人只有手机，39人既有电脑又有手机。V1答案为8人，V2答案为39人
8.矩形长H,宽W, 外围宽度d, 四个角是圆弧，问长方形与外围的面积比(kdavid1945)
（1）H=2W
（2）矩形周长12d
答案：面积比例=HW/(4Hd+πd^2), 结合两个条件，H=4d, W=2d, 答案选C
45. V1. 折纸题，给出了长方形的长(CD=6, DE = 2)，求AD/DB ratio (vgutsc)
求牛人给解答啊！！！马上要考试了，很焦虑 作者: merrymenglu 时间: 2012-3-9 20:13
96. According to the directions on a can of frozen orange juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice.How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?
(A)25
(B)34
(C)50
(D)67
(E)100
============================================== 这题不难. 关键在于看懂题目. 首先 1 can of concentrate is to be mixed with 3 cans of water 就是说. 一份orange juice需要4 can