Question

the mean of five numbers is 30.if one more number is added,the mean still remains 30. find the included number.​

Answer 1

the sum=30×5=150

new no.added=(150+x)/6=30

=150+x=180

=x=180-150

=x=30

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Answer 2

Mean of five number=30

Sum of five number=30x5

=150

If one more number includes then it will become 5+1=6

So,

The mean of six number=30x6

=180

The included number=180-150

=30