Question

A group of 3 numbers has an average of 17. The first two numbers are 12 and 19. What is the third number?

Answer 1

Explanation:

average= x1 + x2 + x3

_____________

no. of data

17 = 12+19+x

_________

3

x = (17×3)-12-19

= 51- 31

= 20

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