document.write( "Question 359452: the mean of a set of numbers is 120. if one number is increases by 300, the mean increases to 135. how many numbers are in the set? \n" ); document.write( "
Algebra.Com's Answer #256517 by edjones(8007)\"\" \"About 
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Let x=numbers in the set.
\n" ); document.write( "(120(x-1)+420)/x=135
\n" ); document.write( "(120x-120+420)/x=135
\n" ); document.write( "(120x+300)/x=135
\n" ); document.write( "120x+300=135x
\n" ); document.write( "15x=300
\n" ); document.write( "x=20 numbers in the set.
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