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Call the digits 'A' and 'B', so that the number is written: AB.

10A + B = 4 (A+B)

10A + B = 4A + 4B

6A = 3B

2A = B ---> any 2-digit number where the units digit is twice the tens digit

12 or 24 or 36 or 48

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Q: A two digit number is four times the sum of its digits?
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