document.write( "Question 29775: I really forgot how do do this type of problem
\n" ); document.write( "$15 is what percent of $75?
\n" ); document.write( "4% of what number is 21?
\n" ); document.write( "What number is 12.5% of 56?
\n" ); document.write( "Could you please help me? Thank you -Rozz \n" ); document.write( "

Algebra.Com's Answer #16464 by Cintchr(481) $\"\"$ $\"About$

You can put this solution on YOUR website!
Percentages can be done many ways. First you need to know some vocabulary.
\n" ); document.write( "\"of\" means multiply
\n" ); document.write( "\"%\" means part of 100
\n" ); document.write( "\"is\" means equals
\n" ); document.write( "\"what number\" is usually represented by x or n
\n" ); document.write( "There is a siple formula that will work for all three types of problems you have stated here.
\n" ); document.write( " $\"+%28is%2Fof%29+=+%28percent%2F100%29+\"$
\n" ); document.write( "$15 is what % of $75
\n" ); document.write( " $\"+%2815%2F75%29+=+%28x%2F100%29+\"$
\n" ); document.write( "cross multiply
\n" ); document.write( " $\"+%2815+%2A+100%29+=+%2875x%29+\"$
\n" ); document.write( "divide both sides by 75
\n" ); document.write( " $\"+%28%2815%29%28100%29%29%2F%2875%29+=+x+\"$
\n" ); document.write( "now just multiply the numerator out and divide by the denomonator.
\n" ); document.write( "or reduce the fraction first, and then multiply and divide. as I did here.
\n" ); document.write( " $\"+%2815%29%284%29%2F%283%29+=+x+\"$
\n" ); document.write( " $\"+60%2F3+=+x+\"$
\n" ); document.write( " $\"+20+=+x+\"$
\n" ); document.write( "and you are done.
\n" ); document.write( " \n" ); document.write( "

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