document.write( "Question 211403: A student has scores of 87.25, 86.5, and 93.75 on his first three tests. He needs an average of at least 90 to earn a grade of A. What is the minimum score that the student needs on the fourth test to ensure a A? \n" ); document.write( "

Algebra.Com's Answer #159768 by Earlsdon(6294) $\"\"$ $\"About$

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Let the fourth test score be x, so to get an average of at least 90 on the four test, then
\n" ); document.write( " $\"%2887.25%2B86.5%2B93.75%2Bx%29%2F4+%3E=+90\"$ Add the numeric scores then multiply both sides by 4.
\n" ); document.write( " $\"267.5%2Bx+%3E=+360\"$ Subtract 267.5 from both sides.
\n" ); document.write( " $\"x+%3E=+92.5\"$
\n" ); document.write( "The minimum score the student needs is 92.5
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