求问一数学题。。我真是白痴了。。。

gbn123

During a 10-week summervacation, was the average (arithmetic mean) number of books that Carolyn readper week greater than the average number of books that Jacob read per week?

(1)   Twice the average number of books thatCarolyn read per week was greater than 5 less than twice the average number ofbooks that Jacob read per week.

(2)   During the last 5 weeks of the vacation,Carolyn read a total of 3 books more than Jacob.

这个（1）到底怎么个意思。看着lz好捉急。。。

gbn123

还有一道啊。。求问各位大神啊。。。
If ¼ of the larger of two numbers is greater than 5 times the smaller of the same two numbers, is the smaller number less than 4?
(1)        The larger number is greater than 70.
(2)        The larger number is less than 80.

mxmdali

reader的题，5<2C<2J, SUFFICIENT

mxmdali

gbn123 发表于 2013-10-4 21:43
还有一道啊。。求问各位大神啊。。。
If ¼ of the larger of two numbers is greater than 5 times the sm ...

已知x>y, 且1/4x>5y, 问y是否小于4
(1)   x=1000000000, y=5 insufficient
(2)   x<80 1/4x<20 5y<20 sufficient