The ratio of the rens digit and the units digit of a two digit number is ` 1 : 2` .How many two digit number satisfy this condition?

The ratio of the rens digit and the units digit of a two digit number is ` 1 : 2` .How many two digit number satisfy this condition?
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The ratio of the rens digit and the units digit of a two digit number is ` 1 : 2` .How many two digit number satisfy this condition?
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