document.write( "Question 154974: Sally was given 5 cents for each test she passed but had to return 10 cents for each she failed. At the end of 3 months she passed four times as many tests as she failed and she had earned 20 cents. How many tests did she pass? \r
\n" ); document.write( "\n" ); document.write( "Hi: My teacher handed this out today and is reprinted from a textbook, but I do not have the IBN number as the textbook is at school. \r
\n" ); document.write( "\n" ); document.write( "Thanks.
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Algebra.Com's Answer #114153 by checkley77(12844)\"\" \"About 
You can put this solution on YOUR website!
5(4x)-10x=20
\n" ); document.write( "20x-10x=20
\n" ); document.write( "10x=20
\n" ); document.write( "x=20/10
\n" ); document.write( "x=2 failed tests.
\n" ); document.write( "4*2=8 passed tests.
\n" ); document.write( "Proof:
\n" ); document.write( "5*8-10*2=20
\n" ); document.write( "40-20=20
\n" ); document.write( "20=20\r
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