gwd-11套 数学 有问题 求帮忙？

Q11:

A certain company that sells only cars and trucksreported that revenues from car sales in 1997 were down 11 percent from 1996and revenues from truck sales in 1997 were up 7 percent from 1996.  If total revenues from car sales and trucksales in 1997 were up 1 percent from 1996, what is the ratio of revenue fromcar sales in 1996 to revenue from truck sales in 1996?

A.    1 : 2

B.     4 : 5

C.     1 : 1

D.    3 : 2

E.     5 : 3

Q23:

One kilogram of a certain coffee blend consists ofx kilogram of type I coffee and y kilogram of type II coffee.  The cost of the blend is C dollars perkilogram, where C = 6.5x + 8.5y.  Is x< 0.8?

(1)     y > 0.15

(2)     C ≥ 7.30