PS:总共66个学生,有18个是business major,24个是新生,还有36个什么也不是,我忘了最后是问,仅仅是新生不是business major 的还是仅仅是business major不是新生的?
构筑答案:好像答案不是12 就是16.。。
解析:
18和24代表的韦恩图圈圈有重合,36代表的是自己单独的圈圈。
Total =66; 36个学生不在Business和Fresh 范畴里面,所以F+B=30;
F 和B的共有学生=12,
是B不是F=6; 是F不是B=12。
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解答:
sysadmin
提问:
GMAT数学(博智教材)第62页:If X is equal to the sum of the even integers from 40 to 60, inclusive, and y is the number of even integers from 40 to 60, inclusive, what is the value of x+y?
X=40+42+44......60=550
Y=(60-40)/2+1=11, 答案应该是561,为什么书后面的答案显示是560?
DS:5个数中 median 小于 average ;另外7个数也median 小于 average,然后这12个数没有重复的,12个数放在一个数集里面,问是不是median 小于average?
条件1:7个的average 小于 5个的average
条件2:7个的median 小于 5个的 median
题目:of the 200 students at college T majoring in one or more of the sciences, 130 are majoring in chemistry and 150 majoring in biology. If at least 30 of the students are not majoring in either chemistry or biology, then the number students majoring in both biology and chemistry could be any number from
a) 20 to 50
b) 40 to 70
c) 50 to 130
d) 110 to 130
e) 110 to 150
问题:这道题能理解到是用集合的知识点,但是无论怎么做都无法突破,得到最后结果。还请老师讲解。谢谢