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three numbers have an average of 15. If two of the numbers is 10 and 12, then what is the other number?
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three numbers have an average of 15. If two of the numbers is 10 and 12, then what is the other number?

User Markstewie
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15*3=45, 45-10-12 is 23. the last number is 23.
User Veener
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