Question

a group of 3 numbers has an anverage of 17 the first two numbers are 12 and 19 what is the third number​

Answer 1

Answer:

20

Step-by-step explanation:

formula to get average of 3 numbers a, b, c is :

(a+b+c)/3

here,

let unknown number be x, so,

(12+19+x)/3 = 17

(12+19+x) = 17*3 = 51

x = 51-(12+19)

x = 20