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题库 / GMATAdvanced-PS-46
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)
$54
$60
$66
$90
$144
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Blue1.8g=7.2q
White1.2g=4.8q
12/q(48/g)和18/g,尽量用加仑买，零头用夸脱买。
blue直接买2加仑划算，white买1加仑和1夸脱划算。
注意gallon和quart都需要买整数个
可计算出需要blue1.8加仑，需要white1.2加仑
blue直接买2加仑合算
white买1加仑和1夸脱划算
mark
1.根据总数算出每个颜色所需要的gallon/quart数量
2.根据每gallon/quart的价格得出尽量买gallon，零头有quart买
Blue1.8g=7.2q
White1.2g=4.8q
12/q(48/g)和18/g,尽量用加仑买，零头用夸脱买。
blue直接买2加仑划算，white买1加仑和1夸脱划算。
1夸特=1/4加仑=12块，1加仑=18块
蓝的要1又4/5加仑=1加仑1.6夸特，购买2加仑更划算；白的要1又1/5加仑=1加仑4/5夸特，购买1加仑1夸特更划算；总共是3加仑1夸特