plums are 75% water. prunes are 15% water.
how much water must be evaporated for x kg of prunes? 这是我今天考场上的题,好像做错了。我乱选了(85x/15) 其他选项有各种 25x/85,15x/75什么的。应该怎么做?
What is the median number of employees assigned per project for the projects at Company Z?
1, 25 percent of the projects at Company Z have 4 or more employees assigned to each project.
2,35 percent of the projects at Companny Z have 2 or fewer employees assigned to each project.
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