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$ 45= 3 books 3 Pens
$ 177= 11 Books 12 Pens

Cost of b=

  • Math -

    3 p + 3b = 45
    11 b + 12 p = 177

    12 b + 12 p = 180

    Subtract the second equation from the third.

    b = 3.

    9 + 12 p = 177
    12 p = 168

    p = ?

  • Math -

    I made a mistake near the end.

    3p + 9 = 45
    3p = 36
    p = 12

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