document.write( "Question 843041: in a set of 12 numbers, if the average of first 5 numbers is 6 and average of all 12 numbers is 7.5, then what is the average of last 7 numbers ? \n" ); document.write( "
Algebra.Com's Answer #507858 by hamsanash1981@gmail.com(151)\"\" \"About 
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the average of first 5 number s = 6, then total numbers = 6*5 = 30
\n" ); document.write( "similarly, total of 12 numbers = 7.5 *12 = 90
\n" ); document.write( "the total of last seven numbers = 90 - 30 = 60
\n" ); document.write( "and its average = 60/7 = 8.57
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