Question

The average of three number is 8 the first two number are 5 and 12 find the third number

Answer 1

Let the unknown no. be 'x'

3 no.s : 5, 12 and x

Avg. of the 3 no.s is 8

5 + 12 + x

-------------- = 8

     3

17 + x = 24

      x = 24 - 17

⇒    x = 7

Answer 2

Answer:

5+13+X

17+X= 24

x=24-17= 7

x= 7

Step-by-step explanation:

Ans= 7