document.write( "Question 498262: kelly earns 40% more than her sister, and together they earn $720 per week. How much does kelly earn per week? \n" ); document.write( "

Algebra.Com's Answer #336999 by Maths68(1474) $\"\"$ $\"About$

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Let Kelly's sister earns = x\r
\n" ); document.write( "\n" ); document.write( "Kelly earns = (x*40%)+x
\n" ); document.write( "Kelly earns = x*(40/100)+x
\n" ); document.write( "Kelly earns = x*(2/5)+x
\n" ); document.write( "Kelly earns = (2x/5)+x\r
\n" ); document.write( "\n" ); document.write( "Together both earns = 720
\n" ); document.write( "x+(2x/5)+x=720
\n" ); document.write( "2x+(2x/5)=720\r
\n" ); document.write( "\n" ); document.write( "Multiply by 5 both sides
\n" ); document.write( "10x+2x=3600
\n" ); document.write( "12x=3600
\n" ); document.write( "Divide by 12 both sides
\n" ); document.write( "12x/12=3600/12
\n" ); document.write( "x=300
\n" ); document.write( "Kelly's sister earns = 300$\r
\n" ); document.write( "\n" ); document.write( "Kelly earns = x*(2/5)+ x
\n" ); document.write( "Put the value of x in above equation
\n" ); document.write( "Kelly earns = 300*(2/5)+300
\n" ); document.write( "Kelly earns = 60*(2)+300
\n" ); document.write( "Kelly earns = 120+300
\n" ); document.write( "Kelly earns = 420$\r
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