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Practice mode Problems on Numbers

A two-digit number is four times the sum of its digits, and its units digit is 2 more than its tens digit. What is the number?

Correct answer C. 24

Explanation

10a + b = 4(a + b) gives b = 2a. With b = a + 2, a = 2 and b = 4, so the number is 24.

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