Posted by **spirit73** on Monday, September 28, 2009 at 3:05pm.

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 -
**MathMate**, Monday, September 28, 2009 at 6:26pm
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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