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Tina Mixes pretzels that sell for $2 a lb with cereal that sells for $3 a lb. she wants to make an 8 lb mixture to sell for $2.50. write 2 equations to represent this info.

How many lbs of pretzels and how many lbs of cereal were used to make the 8 lb mixture?

  • algebra -

    pretzels --- p
    cereal ----- c

    p+c = 8
    2p + 3c = 2.5(8)

    re-write the first : c = 20 - p
    sub into 2nd

    2p + 3(20-p) = 20

    easy to solve

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