Question 814180: Carmen's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Carmen $5.90 per pound, and type B coffee costs $4.40 per pound. This month, Carmen made 148 pounds of the blend, for a total cost of $772.70. How many pounds of type A coffee did she use?
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! 590a + 440b = 77270
a + b = 148
a = 148 - b
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590a + 440b = 77270
590(148 - b) + 440b = 77270
87320 - 590b + 440b = 77270
10050 = 150b
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b = 67
a = 81
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