document.write( "Question 150189This question is from textbook Introduction to Technical Math
\n" ); document.write( ": If you get a 68 on one test, a 73 on a second test and an 84 on the third test, what score must you get on a fourth test in order to have an average of 80? \n" ); document.write( "
Algebra.Com's Answer #110210 by checkley77(12844)\"\" \"About 
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(68+73+84+X)/4=80
\n" ); document.write( "225+X=320
\n" ); document.write( "X=320-225
\n" ); document.write( "X=95 IS THE SCORE REQUIRED ON THE LAST TEST TO MAINTAIN AN AVERAGE OF 80 FOR THE 4 TESTS.
\n" ); document.write( "PROOF:
\n" ); document.write( "(225+95)/4=80
\n" ); document.write( "320=4*80
\n" ); document.write( "320=320\r
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