求助各位大神一道数学难题

mnmicy · 发表于 2020-9-20 11:44:30

请教各位大神能否给讲解一下这道题万分感谢！！！
A certain brand of house paint must be purchased either in quarts at $12 each or in gallons at $18 each. A painter needs a 3-gallon mixture of the paint consisting of 3 parts blue and 2 parts white. What is the least amount of money needed to purchase sufficient quantities of the two colors to make the mixture?(4 quarts = 1 gallon)

A. 54

B. 60

C. 66

D. 90

E. 144

正确选项B

Anderson1996hk · 发表于 2020-9-20 12:53:46

確定是B)嗎？
我算的答案是C) 66,
B : W = 3 : 2
3 gallon裡面 B : W = 9/5 : 6/5
B 的話以gallon為單位去買會最便宜 2 x 18 = 36
W 的話買 1 gallon 和 1 quarts會最便宜 18+12 = 30
36 + 30 = 66

以上

mnmicy · 发表于 2020-9-20 14:00:29

Anderson1996hk 发表于 2020-9-20 12:53
確定是B)嗎？
我算的答案是C) 66,
B : W = 3 : 2

我明白了是理解错了答案是C 谢谢大神

求助各位大神一道数学难题

所属分类: GMAT考试

正在浏览此版块的会员 ()