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THREE NUMBERS HAVE AN AVERAGE OF 15. iF TWO OF THE NUMBERS ARE 10 AND 12, THEN WHAT IS THE OTHER NUMBER?

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Let the third number be x

Equation:
10 + 12 + x = 15
         3

10 + 12 + x = 15 (3)
10 + 12 + x = 45
22 + x = 45
x = 45 - 22
x = 23    The third number is 23.

To check:

10 + 12 + x = 15
        3

10 + 12 + 23 = 15
         3

45 = 15
 3

15 = 15

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