Question

英语数学题，请大家帮忙，谢谢！

A coffee merchant wants to make a mixture of 50 pounds of Colombian and Brazilian coffee that will cost $3.19 per pound . if Colombian coffee sells for $3.35 per pound and Brazilian coffee sells for $2.95 per pound , how much of each type of coffee should be mixed ? 请大家写出步骤！谢谢！

Answer 1

Colombian coffee X, Then Brazilian coffee 1-X
3.35X+2.95(1-X)=3.19
3.35X+2.95-2.95X=3.19
0.4X=0.24
X=0.6
1-X=1-0.6=0.4
So Colombian coffee 60%, Then Brazilian coffee 40%

Answer 2

设哥伦比亚咖啡x磅，巴西咖啡y磅
x+y=50
3.35x+2.95y=3.19·50
x=30，y=20
哥伦比亚咖啡30磅，巴西咖啡20磅
assume Colombian coffee x pounds,Brazilian coffee y pounds
x+y=50
3.35x+2.95y=3.19·50
x=30，y=20
Colombian coffee 30 pounds,Brazilian coffee 20 pounds