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The sum of the digits of a two-digit number is 11. If the digits are reversed, the number increases by 27. What is the number?

Correct answer C. 47

Explanation

Let the digits be a and b. a + b = 11 and 9(b - a) = 27, so b - a = 3. Hence a = 4, b = 7 and the number is 47.

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