document.write( "Question 252808: A student gets 70% in one subject, 80% in the other. To get an overall of 75% how much should get in third subject. \n" ); document.write( "
Algebra.Com's Answer #184875 by richwmiller(17219)\"\" \"About 
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(.70+.80+x)/3=.75
\n" ); document.write( ".7+.8+x=3*.75
\n" ); document.write( "1.5+x=2.25
\n" ); document.write( "x=.75=75%
\n" ); document.write( "we could also have reasoned that (.70+.80)/2=.75 already so he needs to get .75 (75%) to maintain the 75%
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