document.write( "Question 347595: On his last 3 math tests, Mark scored 85,95 and 80. what grade must he get on his next test to have an average of 90 for all four tests? \n" ); document.write( "
Algebra.Com's Answer #248471 by Fombitz(32388)\"\" \"About 
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Let his next grade be \"X\".
\n" ); document.write( "\"%2885%2B95%2B80%2BX%29%2F4%3E=90\"
\n" ); document.write( "\"260%2BX%3E=360\"
\n" ); document.write( "\"highlight%28X%3E=100%29\"
\n" ); document.write( "He needs a perfect score.\r
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