document.write( "Question 928157: Kevin will take 4 math tests this term. All of the tests are worth the same number of points. After taking the first 3 tests, his mean test score is 88 points. How many points does he need on his last test to raise his mean test score to 90 points? \n" ); document.write( "
Algebra.Com's Answer #563523 by TimothyLamb(4379)\"\" \"About 
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x = score he needs on the fourth test
\n" ); document.write( "y = sum of scores of the first three tests
\n" ); document.write( "---
\n" ); document.write( "y/3 = 88
\n" ); document.write( "y = 3*88
\n" ); document.write( "y = 264
\n" ); document.write( "---
\n" ); document.write( "(264 + x)/4 = 90
\n" ); document.write( "264 + x = 90*4
\n" ); document.write( "x = 90*4 - 264
\n" ); document.write( "x = 96
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "x = score he needs on the fourth test = 96
\n" ); document.write( "---
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