document.write( "Question 519750: The Everton College Store paid $1792 for an order of 51 calculators. The store paid $9 for each scientific calculator. The others, all graphing calculators, cost the store $52 each. How many of each type of calculator was order? \n" ); document.write( "
Algebra.Com's Answer #345766 by oberobic(2304)\"\" \"About 
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s = number of scientific calculators
\n" ); document.write( "9s = cost of the scientific calculators
\n" ); document.write( "g = graphing calculators
\n" ); document.write( "52g = cost of the graphing calculators
\n" ); document.write( ".
\n" ); document.write( "s + g = 51
\n" ); document.write( "so
\n" ); document.write( "s = 51-g
\n" ); document.write( ".
\n" ); document.write( "9s + 52g = 1792
\n" ); document.write( ".
\n" ); document.write( "substitute
\n" ); document.write( ".
\n" ); document.write( "9(51-g) +52g = 1792
\n" ); document.write( "459 -9g +52g = 1792
\n" ); document.write( "43g = 1792 - 459
\n" ); document.write( "43g = 1333
\n" ); document.write( "g = 31
\n" ); document.write( ".
\n" ); document.write( "s = 51-31
\n" ); document.write( "s = 20
\n" ); document.write( ".
\n" ); document.write( "Answer: They bought 20 scientific calculators and 31 graphing calculators.
\n" ); document.write( ".
\n" ); document.write( "Check the values to make sure.
\n" ); document.write( "9(20) = 180
\n" ); document.write( "52(31) = 1612
\n" ); document.write( "180+1612 = 1792
\n" ); document.write( "Correct.
\n" ); document.write( ".
\n" ); document.write( "Done.\r
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