SOLUTION: The tens digit of a 2-digit nuber is twice the units digit. The sum of the digits is 12. What is the original number?

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Question 425299: The tens digit of a 2-digit nuber is twice the units digit. The sum of the digits is 12. What is the original number?
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

unit digit = x
tens digit = 2x
number is 2x*10 + x
2x+ x = 12
=> x =12/3 = 4

number is : 84