document.write( "Question 373440: carlos worked 31.5 hours at a hospital as a volunteer. this represents 87.5% of his schools requirement for community service. how many hours does his school require for community service \n" ); document.write( "

Algebra.Com's Answer #265787 by fractalier(6550) $\"\"$ $\"About$

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For this you can set up the proportion
\n" ); document.write( "31.5 is to x as 87.5% is to 100%, that is
\n" ); document.write( " $\"31.5%2Fx+=+87.5%2F100\"$
\n" ); document.write( "Normally we might cross-multiply, but notice that 87.5/100 reduces to 7/8...so we can simply write
\n" ); document.write( " $\"31.5%2Fx+=+7%2F8\"$ and
\n" ); document.write( " $\"7x+=+8+x+31.5+=+252\"$ and
\n" ); document.write( "x = 36 hours \n" ); document.write( "

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