[求助]几题GMATprep题，看不懂题目意思且不会做，请帮忙啊！

1 which of the following lists the number of points at which a circle can intersect a triangle？

A 2 and 4 only

B 2, 4 and 6 only

C 1,2,3 and 6 only

D1,2,3,4, and 6 only

E 1, 2, 3, 4, 5 and 6 only

answer :E

what is lists the number of points mean? 不明白求什么。。。

2 is the measure of one of the interior angles of quadrilateral ABCD equel to 60 degrees？

1) two of the interior angles of ABCD are right angles

2) the degree measure of angle ABC is twice the degree measure of angle BCD

E

四边形的内角和为360度，我根据条件1和条件2得出： 90+90+x+2x=360，得到x=60，选C，请问哪里想错了？

3 if m and r are two numbers on number line, what is the value of r?

1) the distance between r and 0 is 3 times the distance between m and 0

2) 12 is halfway between m and r

E

根据条件1，2，我可以得到一个方程组得出m=6， r=18，请问我在哪里想错了，还有12 is halfway between m and r 是什么意思啊？

4 is the integer n odd?

1) n is divisble by 3

2) 2n is divisble by twice as many positive integers as n

B

2n is divisble by twice as many positive integers as n 是什么意思啊？

5 a store purchased 20 coats that each cost an equal amount and then sold each of the 20 coats at an equal price. what was the store's gross profit on the 20 coats?

1) if the selling price per coat had been twice as much, the store's gross profit on the 20 coats would have been $2,400

2) if the selling price per coat had been $2 more, the store's gorss profit on the 20 coats would have been $440

B

请问条件1中twice as much 是什么意思啊？ 还有，为什么条件1做不出来？

6 if x<0, then 根号下 -xlxl =?

答案：-x

请问如何得出答案的阿？怎么想也不明白。。。

1 which of the following lists the number of points at which a circle can intersect a triangle？

问的是下面那个选项列举出了一个圆跟一个三角形交点个数的所有可能性。

谢谢楼上的，明白你的解释了：）

等待其他问题中。。。

2 is the measure of one of the interior angles of quadrilateral ABCD equel to 60 degrees？

1) two of the interior angles of ABCD are right angles

2) the degree measure of angle ABC is twice the degree measure of angle BCD

E

四边形的内角和为360度，我根据条件1和条件2得出： 90+90+x+2x=360，得到x=60，选C，请问哪里想错了？

错在你理所当然的认为角abc不是直角了，而题目没告诉我们这个信息，所以，如果当abc就恰好是那个直角时，依题意四边形的四个角度数就分别是90，90，45，135了，而不必然是60度。

3 if m and r are two numbers on number line, what is the value of r?

1) the distance between r and 0 is 3 times the distance between m and 0

2) 12 is halfway between m and r

E

根据条件1，2，我可以得到一个方程组得出m=6， r=18，请问我在哪里想错了，还有12 is halfway between m and r 是什么意思啊？

这题你漏考虑m在0左边的情况了，当m在0左边时，r＝36

12 is halfway between m and r就是12是m跟r中点的意思

4 is the integer n odd?

1) n is divisble by 3

2) 2n is divisble by twice as many positive integers as n

2n is divisble by twice as many positive integers as n 是什么意思啊？

这句话的意思就是，被除数2n的正整数除数个数是n的正整数除数个数的两倍

5 a store purchased 20 coats that each cost an equal amount and then sold each of the 20 coats at an equal price. what was the store's gross profit on the 20 coats?

1) if the selling price per coat had been twice as much, the store's gross profit on the 20 coats would have been $2,400

2) if the selling price per coat had been $2 more, the store's gorss profit on the 20 coats would have been $440

B

请问条件1中twice as much 是什么意思啊？ 还有，为什么条件1做不出来？

twice as much就是两倍的意思。

设每件成本x元，每件售价y元，据1可列出20y＝2400，由此得出y=120，

而总利润的求法是20（y－x），由于我们不知道每件的成本价，所以不能求出总利润

加油：）

谢谢鼓励：）

再麻烦你多两题DS。。。

1 Malik's recipe for 4 servings of a certain dish requires 1.5 cups of pasta. According to the recipe, what is the number of cups of pasta that Malik will use next time he prepares this dish?

1) the next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish

2)Malik used six cups of pasta trhe last time he prepared this dish

2 of the 60 animals on a certain farm, 2/3 are either pigs or cows,  how many of the animals are cows?

1) farm has more than twice as many as cow as it has pigs

2) farm has more than 12 pigs

我是不是太笨了。。。

谢谢你的帮忙

你是想我翻译还是解题啊？

第一题题目说malik做4道这样的dish要用1。5杯pasta，问根据这种配料比例，下次要做这种dish要用多少pasta。感觉这道题怪怪的，不像是DS题啊，由其是2)Malik used six cups of pasta trhe last time he prepared this dish，给的信息怪怪的，告诉我们做这道dish用6杯pasta还有什么好证明的？

第二题说农场上60只畜牲，2/3是猪或者牛，问牛有多少只

我们设猪有x只，农场有的猪或牛数目为60×2/3＝40只，

根据1）我们可以列出40－x>2x(因为牛的数目比两倍猪的数目多)，可是光知道这个不等式我们只能得出x<40/3

根据2）我们又得知x>12，同样，光这个不等式我们也不能得到什么。

然而联立两个不等式的12<x<40/3,因为x只能是整数，所以x＝13。也就是说1&2together are sufficient

其实我也很怕DS题，大家一起加油噢，千万别说自己笨，能力都是在不断练习跟总结中提升的：）加油！！