document.write( "Question 1084173: Christopher has completed three mathematics tests. his mean mark is 69%. what percentage mark does he have to get in his next test to increase the mean to 70%? \n" ); document.write( "
Algebra.Com's Answer #698244 by josgarithmetic(39617)\"\" \"About 
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\"%283%2A69%2Bx%29%2F4=70\"\r
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\n" ); document.write( "\n" ); document.write( "\"x=280-3%2A69\"\r
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\n" ); document.write( "\n" ); document.write( "73
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