题库 | 考满分，百万出国党的口碑之选。

PREP07 Test 2 PREP07 Test 1 Manhattan Magoosh KMFPS 排列组合几何应用题代数数论 OG20 OG21 OG20-数学分册 OG20-语文分册 OG19-数学分册 OG19 OG18-数学分册 OG18 OG17 OG16 OG15 OG12 OG2022

《(2012)GMAT官方指南》 OG 12

《(2012)GMAT官方指南》是GMAC（GMAT考试命题机构）中国大陆的单家授权版本，是GMAT考试必备参考书。书中提供超过800道全真试题，涵盖GMAT考试所有题型，并配有全面的答案解析。题目按难易程度排列，帮助考生节省备考时间。其中，OG12的PS部分共有 230 题，全部经由老师核对确认并标上题号及难度（根据官方标准划分）。

题目列表

序号	题目内容
221	Of the 200 students at College T majoring in one or more of the sciences, 130 are majoring in chemistry and 150 are majoring in biology. If at least 30 of the students are not majoring in either chemistry or biology, then the number of students majoring in both chemistry and biology could be any number from
222	If $$5-\frac{6}{x}=x$$ then x has how many possible values?
223	Seed mixture X is 40 percent ryegrass and 60 percent bluegrass by weight; seed mixture Y is 25 percent ryegrass and 75 percent fescue. If a mixture of X and Y contains 30 percent ryegrass, what percent of the weight of the mixture is X ?
224	If n is a positive integer, then n(n + l)(n + 2) is
225	A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?
226	if $$\frac{(0.0015\times10^m)}{(0.03\times10^k)}={5}\times{10}^{7}$$,then m-k=
227	if x+y=a and x-y=b,then 2xy=
228	P, r, s, t, uAn arithmetic sequence is a sequence in which each term after the first is equal to the sum of the preceding term and a constant.If the list of letters shown above is an arithmetic sequence, which of the following must also be an arithmetic sequence?I 2P, 2r, 2s, 2t, 2uII P-3, r-3, s-3, t-3, u-3III $${P}^{2}$$, $${r}^{2}$$, $${s}^{2}$$, $${t}^{2}$$, $${u}^{2}$$
229	Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and $$\overline{PR}$$ is parallel to the x-axis. The x- and y-coordinates of P, Q, and R are to be integers that satisfy the inequalities $$-4 \le x \le 5$$ and $$6 \le y \le 16$$. How many different triangles with these properties could be constructed?
230	The value of $$\frac{({2}^{-14}+{2}^{-15}+{2}^{-16}+{2}^{-17})}{5}$$ is how many times the value of$${2}^{-17}$$?