Question

John chose 4 numbers
The average of the 4 numbers is 9
If 3 of those numbers are 5, 9, and 12
What is the fourth number?
Answer:
07
13
None of the above​

Answer 1

Answer:

Correct answer - 10

Explanation:

None of the above

Answer 2

Answer:

10, none of the above

Explanation:

As we know that , average = sum of observation/no. of observation

=> so

9 = sum of four no./4

=> sum of no. = 36

=> also three no. are given then

let 4 no. is X

=> 5+9+12+x = 36

=> x = 36-26

=> x = 10