document.write( "Question 585870: 50 children bought either chocolate or white milk. Chocolate milk costs $.30 and white milk costs $.25. the total cost of milk sold was 13.30.How man chocolate and white milks were sold?\r
\n" ); document.write( "\n" ); document.write( "Easiest way to solve this. \n" ); document.write( "

Algebra.Com's Answer #373517 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"a\"$ = number of white milks sold
\n" ); document.write( "Let $\"b\"$ = number of chocolate milks sold
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"+a+%2B+b+=+50+\"$
\n" ); document.write( "(2) $\"+25a+%2B+30b+=+1330+\"$ ( in cents )
\n" ); document.write( "-------------------
\n" ); document.write( "Multiply both sides of (1) by $\"+25+\"$
\n" ); document.write( "and subtract (1) from (2)
\n" ); document.write( "(2) $\"+25a+%2B+30b+=+1330+\"$
\n" ); document.write( "(1) $\"+-25a+-+25b+=+-1250+\"$
\n" ); document.write( " $\"+5b+=+80+\"$
\n" ); document.write( " $\"+b+=+16+\"$
\n" ); document.write( "and, since
\n" ); document.write( "(1) $\"+a+%2B+b+=+50+\"$
\n" ); document.write( "(1) $\"+a+%2B+16+=+50+\"$
\n" ); document.write( "(1) $\"+a+=+34+\"$
\n" ); document.write( "34 white milks were sold
\n" ); document.write( "16 chocolate milks were sold
\n" ); document.write( "check answer:
\n" ); document.write( "(2) $\"+25a+%2B+30b+=+1330+\"$
\n" ); document.write( "(2) $\"+25%2A34+%2B+30%2A16+=+1330+%7D%7D%0D%0A%282%29+%7B%7B%7B+850+%2B+480+=+1330+\"$
\n" ); document.write( "(2) $\"+1330+=+1330+\"$
\n" ); document.write( "OK \n" ); document.write( "

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