document.write( "Question 324916: Martin’s average (arithmetic mean) score after 4 tests is 89. What score on the 5th test would bring Martin’s average up to exactly 90?\r
\n" ); document.write( "\n" ); document.write( "(A) 90 (B) 91 (C) 92 (D) 93 (E) 94\r
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Algebra.Com's Answer #232629 by JBarnum(2146)\"\" \"About 
You can put this solution on YOUR website!
since the average is 89 we really dont need to know what the 4 tests scores are sin 4 89's would have the same average
\n" ); document.write( "\"%2889%2B89%2B89%2B89%2Bx%29%2F5=90\" multiply by 5
\n" ); document.write( "\"%2889%2B89%2B89%2B89%2Bx%29=450\" add the 89s
\n" ); document.write( "\"%28356%2Bx%29=450\" subtract 356
\n" ); document.write( "\"x=94\"
\n" ); document.write( "E
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