Question

My number is a 2-digit multiple of 9. The ratio of its units digit to its tens digit is 1:2. What is my number?

Answer 1

The answer is:  63  .
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Explanation:
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First, let's list all the 2-digit multiples of "9":
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18, 27, 36, 45, 54, 63, 72, 81, 90, 99.
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From this list, the only answer that has a ratio in which its "units digits to its tens digits" is "1:2"  is:  "63" .   "3:6"  = "1:2" .

So the answer is:  63 .
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