document.write( "Question 325577: the arithmetic mean of five numbers is 60. if the arithmetic mean of the first four numbers is 70, what is the fifth number? \n" ); document.write( "
Algebra.Com's Answer #233105 by mananth(16946)![]() ![]() You can put this solution on YOUR website! arithmetic mean of five numbers = 60 \n" ); document.write( "so the sum of the numbers = 60*5 =300 \n" ); document.write( ".. \n" ); document.write( "first four numbers mean = 70 \n" ); document.write( "sum of these 4 numbers = 280.\r \n" ); document.write( "\n" ); document.write( "so the 5th number is 300-280=20 \n" ); document.write( "the fifth number is 20 \n" ); document.write( " |