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27 September, 06:45

Type A coffee costs Bill 4.30

per pound, and type B coffee costs 5.70

per pound. This month, Bill made 168

pounds of the blend, for a total cost of 855.40

. How many pounds of type B coffee did he use?

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Answers (1)
  1. 27 September, 07:54
    0
    4.30A+5.70B=855.40

    A+B=168

    A=168-B

    substitute

    4.30 (168-B) + 5.70B=855.40

    4.30*168-4.30B+5.70B=855.40

    1.40B = 855-4.30*168

    1.40B=132.60

    B=132.60/1.40 = 94.7 pounds≈95 pouds
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