Question

The average of 5 numbers is 23. If the 4 numbers are 18, 27,22 and 20 then find the 5th number?

Answer 1

Answer: The fifth number is 28

Explanation:

All numbers = 18, 27, 22, 20, x

5th number is x

So,
`(18+27+22+20+x)/(5)` = 23 (as the there are 5 numbers)

=>
`(87+x)/(5)` = 23

=> 87+x = 115

=> x = 28

Therefore the 5th number is 28

hope it helps

no problems

Answer 2

5th number = 28

Explanation:

23*5 = 115

The sum of the 5 numbers is

115

Then:

18 + 27 + 22 + 20 + a = 115

a = 5ft number

87 + a = 115

a = 115 - 87

a = 28

Check:

(18+27+22+20+28)/5 = 23

115/5 = 23