# The mean of 10 number is 55, if one number is included,their mean becomes 60. Find the included number.

2
by Coolaks

2016-03-20T19:55:40+05:30

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Let the sum of numbers be x
then x/10=55
x=550
now one number is included let that be Y
now the sum would be 550+Y
and the total numbers would be 10+1=11
550+y/11=60
550+y=660
y= -100
ok
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2016-03-20T20:02:48+05:30

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Let the sum of numbers be x
x/10=55
x=550
when the number is included
550+y/11=60
550+y=660
y= -100