Question

The average of seven numbers is 23. If we do not consider the last number , new average is 21. What is the Last number

Answer 1

Answer:

last number is 35

Step-by-step explanation:

Avg=x/7=23

x=23*7

x=161

let the last number be 'a'

161-a/6=21

-a=21*6-161

-a=-35

cancell the minus both sides

a=35

therefore,the last number 'a' is 35

I hope this will help you.

Thank You

Answer 2

Answer:

Average weight of 7 pupils= 23

Average weight of 6 pupils = 21( not considering the last number makes it 6 pupils)

total weight of 7 pupils = 7 *23= 161

total weight of 6 pupils = 6*21=126

last nnumber Would be

16161 - 126 =35

Step-by-step explanation: