document.write( "Question 479145: if ratio of two numbers \"a\" and \"b\" is 3 to 4 and their sum is 420. Find a-b \n" ); document.write( "

Algebra.Com's Answer #328317 by Tatiana_Stebko(1539) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"system%28a%2Fb=3%2F4%2C+a%2Bb=420%29\"$
\n" ); document.write( "from the first equation $\"a=%283%2F4%29b\"$ substitute into the second equation
\n" ); document.write( " $\"%283%2F4%29b%2Bb=420\"$
\n" ); document.write( " $\"%287%2F4%29b=420\"$ divide by 7
\n" ); document.write( " $\"%281%2F4%29b=60\"$ multiply by 4
\n" ); document.write( " $\"b=240\"$
\n" ); document.write( "substitute $\"b=240\"$ into $\"a=%283%2F4%29b\"$ , $\"a=%283%2F4%29%2A240=180\"$ \r
\n" ); document.write( "\n" ); document.write( "Then $\"a-b=180-240=-60\"$ \n" ); document.write( "

\n" );