Question

The average of 7 numbers is 128. Find the seventh number if the other six numbers are 127,
132, 118, 129, 122 and 139.
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Answer 1

Answer:

Step-by-step explanation:

since, the average of seven numbers is 128.

so, the sum of the 7 numbers =7×128

=896

now, the sum of six numbers is 127+133+118+129+122+139=768

hence, the 7th number =896-768

=128

Answer 2

Answer:

let the 7th no. be x

128=127+133+118+129+122+139+x/7

128×7=768+x

896-768=x=128