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) ![]() You can put this solution on YOUR website! 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( " |