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March 25, 2017

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the everton college store paid $1553 for an order of 42 calculators. the store paid $9 for each scientific calculator. the others, all graphing calculators, cost the store $56 each. how many of each trupe of calculator was ordered?

the store ordered:
how many scientfic calculators?

graphing calculators?

  • algebra 1 - ,

    Let
    S = number of scientific calculators

    "an order of 42 calculators."
    42-S = number of graphing calculators.

    "the store paid $9 for each scientific calculator... graphing calculators, cost the store $56 each"

    Total cost
    = $9*S + $56*(42-S)
    Since the total cost is $1553, solve for S in
    $1553 = $9*S + $56*(42-S)

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