document.write( "Question 238715: Your last science test was worth 180 points. The test contained 42 questions, which were worth either 3 points, or 5 points each. How many 5-point questions were on the test? \n" ); document.write( "
Algebra.Com's Answer #175417 by checkley77(12844)\"\" \"About 
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3x+5(42-x)=180
\n" ); document.write( "3x+210-5x=180
\n" ); document.write( "-2x=180-210
\n" ); document.write( "-2x=-30
\n" ); document.write( "x=-30/-2
\n" ); document.write( "x=15 5 point questions were on the test.
\n" ); document.write( "42-15=27 3 points questions were on the test.
\n" ); document.write( "Proof:
\n" ); document.write( "3*15+5*27=180
\n" ); document.write( "45+135=180
\n" ); document.write( "180=180
\n" ); document.write( "
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