document.write( "Question 692309: The average of the first three numbers was 11. The average of the other seven numbers was 12. What was the overall average of the numbers? \n" ); document.write( "
Algebra.Com's Answer #426964 by htmentor(1343)\"\" \"About 
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The average of the first 3 numbers = S3/3 = 11 -> S3 = 33
\n" ); document.write( "where S3 = the sum of the first 3 numbers
\n" ); document.write( "The average of the other 7 numbers = S7/7 = 12 -> S7 = 84
\n" ); document.write( "So the overall average = (S3+S7)/10 = (33+84)/10 = 11.7
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