document.write( "Question 1124508: 500 people were at cinema house. some of them paid 15cents. and the rest paid 20cents. of the total cash collected was $91, find the number of the 15 cents \n" ); document.write( "
Algebra.Com's Answer #740812 by josmiceli(19441)\"\" \"About 
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Let \"+a+\" = 15 cent payers
\n" ); document.write( "Let \"+b+\" = 20 cent payers
\n" ); document.write( "—————————-
\n" ); document.write( "(1) \"+a+%2B+b+=+500+\"
\n" ); document.write( "(2) \"+.15a+%2B+.2b+=+91+\"
\n" ); document.write( "————————————-
\n" ); document.write( "(2) \"+15a+%2B+20b+=+9100+\"
\n" ); document.write( "Multiply both sides of (1) by \"+15+\"
\n" ); document.write( "and subtract (1) from (2)
\n" ); document.write( "(2) \"+15a+%2B+20b+=+9100+\"
\n" ); document.write( "(1) \"+-15a+-+15b+=+-7500+\"
\n" ); document.write( "———————————————
\n" ); document.write( "\"+5b+=+1600+\"
\n" ); document.write( "\"+b+=+320+\"
\n" ); document.write( "And
\n" ); document.write( "(1) \"+a+%2B+320+=+500+\"
\n" ); document.write( "(1) \"+a+=+180+\"
\n" ); document.write( "————————————
\n" ); document.write( "There were 180 15 cent payers
\n" ); document.write( " \n" ); document.write( "
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