document.write( "Question 270194: You are taking a course that has 4 tests. The first 3 tests are 100 points each and the fourth test is 200 points. To get an A in the course, you must have an average of at least 90% on the four tests. Your scores on the first three tests were 87,92,and 84. What must you score on the 4th test to get an A for the course? \n" ); document.write( "
Algebra.Com's Answer #197960 by Theo(13342)\"\" \"About 
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Your scores are 87, 92, 84.\r
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\n" ); document.write( "\n" ); document.write( "To get an average of 90 on all four tests, your formula needs to be:\r
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\n" ); document.write( "\n" ); document.write( "87 + 92 + 84 + x = 90*4\r
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\n" ); document.write( "\n" ); document.write( "Combine like terms and simplify to get:\r
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\n" ); document.write( "\n" ); document.write( "263 + x = 360\r
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\n" ); document.write( "\n" ); document.write( "Subtract 263 from both sides of the equation to get:\r
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\n" ); document.write( "\n" ); document.write( "x = 360 - 263 = 97.\r
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\n" ); document.write( "\n" ); document.write( "You need to get a 97 on the last test.\r
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\n" ); document.write( "\n" ); document.write( "Then you would get the following:\r
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\n" ); document.write( "\n" ); document.write( "87 + 92 + 84 + 97 = 360\r
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\n" ); document.write( "\n" ); document.write( "360/4 = 90% overall average on the 4 tests.\r
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