Verified Answer :

TSO

\(\frac{10+12+x}{3} = 15\\\\10 + 12 + x = 45\\\\22 + x = 45\\\\\huge{\boxed{x = 23}|\)

DigitalAngel

10 + 12 + 23 ÷ 3 = 15
22 + 23 ÷ 3 =15
45 ÷ 3 = 15

The missing number would be 23 since 22 + 23 is 45 and 45 divided by 3 is 15.
Hope this helped :)

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