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9 February, 15:19

Jacob's printing Inc. Has two type of printing presses:model A and Model B. Model A can print 40 books per day and Model B can print 70 books per day. Altogether jacob has 12 printing presses. If he can ptint 600 books in a day then how many of each press does he have?

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  1. 9 February, 17:36
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    A=number of a models

    b=number of b models

    total number of books=abooks+bbooks

    abooks=a times number of books per day or 40

    bbooks=b times number of books per day or 70

    total number of presses is 12 or a+b

    so we have 2 equations

    40a+70b=600 and

    a+b=12

    we can use eliminateion

    multiply 2nd equation by - 40 and add to top equation

    40a+70b=600

    -40a-40b=-480 +

    0a+30b=120

    30b=120

    divide both sides by 30

    b=4

    sub back

    a+b=12

    a+4=12

    minus 4

    a=8

    he has 8 of the A model machines and 4 of the B model machines
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