Question

The ten digit number of a two-digit is twice the units digit . If the digit are reversed the new number is 18 less than the original number . Find the number.

Answer 1

The two digit number can be:

21, 42, 63, 84

Now reverse those numbers and subtract to find one with a difference of 18:

21 - 12 = 9

42 - 24 = 18

The number would be 42.