25 + __ = 18 + 12.

What number is missing?

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• A 5
• B 30
• C 43
• D 55

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Answer: A. 5

Explanation: First solve the right side: 18 + 12 = 30. So the equation is 25 + __ = 30. The missing number is 5 (25 + 5 = 30).

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