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

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Question 422551: The tens digit of a 2-digit number is twice the units digit. The sum of the digits is 12. Find the original number.
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

let unit digit = x, tens digit =2x
2x + x = 12
=> x =12/3 =4
so, original number is 84.