请教PREP-PS2-21***急**

wj37044

21.        2988-!-item-!-187;#058&003110

A company wants to buy computers and printers for a new branch office, and the number of computers can be at most 3 times the number of printers.  Computers cost $1,500 each, and printers cost $300 each.  What is the greatest number of computers that the company can buy if it has a total of $9,100 to spend on computers and printers?

 

(A) 2

(B) 3

(C) 4

(D) 5

(E) 6

请问如何解，实在想不通

AT most 3 time   是不是说computer no <= 3* printer

fiona9179119

答案是 5么

hang13

试一下嘛

C 6 就是9000，9100-9000=100，P =0 不行

C 5 就是7500，9100-7500=1600，P=5

是这样吗？

[此贴子已经被作者于2009-3-24 12:44:17编辑过]

wj37044

是5

fiona9179119

hang 的方法简单多了

我就是 设computer=x
printer=y
 3y<=x
1500x+300y<=9100
 that is all
我记得这个是高二学的线性规划

floridadream

试两个数就行了 但关键是看懂题