document.write( "Question 902739: You score a 82 and 86 on the first 2 tests in your math class. You would like for your average after 3 tests to be at least a 90. Assuming that each test is worth 100 points. Is this possible? If not, why not? If yes, what score must you make to have at least a 90 average. I'm not very sure how to do this problem. \n" ); document.write( "
Algebra.Com's Answer #547492 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! You score a 82 and 86 on the first 2 tests in your math class. You would like for your average after 3 tests to be at least a 90. Assuming that each test is worth 100 points. Is this possible? If not, why not? If yes, what score must you make to have at least a 90 average. \n" ); document.write( "------- \n" ); document.write( "Let the 3rd test score be \"x\". \n" ); document.write( "Equation: \n" ); document.write( "(82+86+x)/3 >= 90 \n" ); document.write( "--------- \n" ); document.write( "(168+x) = 270 \n" ); document.write( "x = 270-168 \n" ); document.write( "x = 102 \n" ); document.write( "----- \n" ); document.write( "Ans: Impossible because you cannot get a score of 102 on the 3rd test. \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( "=============== \n" ); document.write( " |