document.write( "Question 4636: (Please show steps and explain):\r
\n" ); document.write( "\n" ); document.write( "Namid had an average of 74 on four history tests. What score does he have to get on the 100-point final exam if it counts double and he wants to have an average of 80 or better? \n" ); document.write( "
Algebra.Com's Answer #2154 by longjonsilver(2297)\"\" \"About 
You can put this solution on YOUR website!
on the 4 test so far, he has averaged 4*74 --> 296 marks out of 400.\r
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\n" ); document.write( "\n" ); document.write( "We need to find the score on the final exam (out of 100) to bring his average up to 80% or better. And this final exam is counted double:\r
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\n" ); document.write( "\n" ); document.write( "so, \"%28%28296%2Bx%2Bx%29%2F600%29%2A100+=+80\"\r
\n" ); document.write( "\n" ); document.write( "\"%28%28296%2B2x%29%2F6%29+=+80\"
\n" ); document.write( "\"%28296%2B2x%29+=+480\"
\n" ); document.write( "2x = 480-296
\n" ); document.write( "2x = 184
\n" ); document.write( "so x = 92\r
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\n" ); document.write( "\n" ); document.write( "jon\r
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