Question

Average of four numbers is 12.5, Three of these numbers are 14,16 and 10. Find the fourth number.

Answer 1

Find sum of all the numbers:

Average of 4 numbers = 12.5

Sum of the 4 numbers = 12.5 x 4 = 50

Find the fourth number:

Fourth number = 50 - 14 - 16 - 10 = 10

Answer: The fourth number is 10

Answer 2

Heya !!




Let four numbers are X1 , X2 , X3 and X4.




X1 = 14

X2 = 16



X3 = 10



X4 = ?

Average of four numbers = 12.5





X1+X2+X3+X4/4 = 12.5


14 + 16 + 10 + X4 = 50


X4 = 50 - 40



X4 = 10



Hence,


Fourth number is 10.