document.write( "Question 824357: If 5 is added both to the numerator and denominator of a fraction, the result is equivalent to 3/4. If 3 is subtracted from both numerator and denominator of the original fraction, the new result is equivalent to 1/4. Find the orginal fraction. \n" ); document.write( "
Algebra.Com's Answer #496368 by josmiceli(19441)\"\" \"About 
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Let the original fraction = \"+a%2Fb+\"
\n" ); document.write( "given:
\n" ); document.write( "(1) \"+%28+a+%2B+5+%29+%2F+%28+b+%2B+5+%29+=+3%2F4+\"
\n" ); document.write( "and
\n" ); document.write( "(2) \"+%28+a+-+3+%29+%2F+%28+b+-+3+%29+=+1%2F4+\"
\n" ); document.write( "----------------------------
\n" ); document.write( "Multiply both sides of (1) by \"+4%2A%28+b+%2B+5+%29+\"
\n" ); document.write( "(1) \"+4%2A%28+a%2B5+%29+=+3%2A%28+b%2B5+%29+\"
\n" ); document.write( "(1) \"+4a+%2B+20+=+3b+%2B+15+\"
\n" ); document.write( "(1) \"+3b+-+4a+=+5+\"
\n" ); document.write( "------------------
\n" ); document.write( "Multiply both sides of (2) by \"+4%2A%28+b-3+%29+\"
\n" ); document.write( "(2) \"+4%2A%28+a-3+%29+=+b+-+3+\"
\n" ); document.write( "(2) \"+4a+-+12+=+b+-+3+\"
\n" ); document.write( "(2) \"+-b+%2B+4a+=+9+\"
\n" ); document.write( "Add (1) and (2)
\n" ); document.write( "(1) \"+3b+-+4a+=+5+\"
\n" ); document.write( "(2) \"+-b+%2B+4a+=+9+\"
\n" ); document.write( "\"+2b+=+14+\"
\n" ); document.write( "\"+b+=+7+\"
\n" ); document.write( "and, since
\n" ); document.write( "(1) \"+3b+-+4a+=+5+\"
\n" ); document.write( "(1) \"+3%2A7+-+4a+=+5+\"
\n" ); document.write( "(1) \"+4a+=+21+-+5+\"
\n" ); document.write( "(1) \"+4a+=+16+\"
\n" ); document.write( "(1) \"+a+=+4+\"
\n" ); document.write( "------------
\n" ); document.write( "\"+a%2Fb+=+4%2F7+\"
\n" ); document.write( "The original fraction is 4/7
\n" ); document.write( "check:
\n" ); document.write( "(2) \"+-b+%2B+4a+=+9+\"
\n" ); document.write( "(2) \"+-7+%2B+4%2A4+=+9+\"
\n" ); document.write( "(2) \"+-7+%2B+16+=+9+\"
\n" ); document.write( "(2) \"+9+=+9+\"
\n" ); document.write( "OK
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