SOLUTION: The tens digits of a number is 2 less than the units digit. The sum of the digits is 12. Identify what the number is.

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Question 264377: The tens digits of a number is 2 less than the units digit. The sum of the digits is 12. Identify what the number is.
Found 3 solutions by mananth, ikleyn, josgarithmetic:
Answer by mananth(16949) About Me  (Show Source):
You can put this solution on YOUR website!
let the unit digit be x
ten's digit will be x-2
x+x-2 =12
2x=10
x=5
the other digit = 3
The number is 35

Answer by ikleyn(53751) About Me  (Show Source):
You can put this solution on YOUR website!
.
The tens digits of a number is 2 less than the units digit. The sum of the digits is 12.
Identify what the number is.
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        The solution in the post by @mananth is incorrect due to an arithmetic error in his calculations.
        I came to bring a correct solution.


let the unit digit be x
ten's digit will be x-2
x + (x-2) = 12
2x = 14
x = 7 (the units digit)
the tens digit = 7 - 2 = 5
The number is 57.             ANSWER

Solved correctly.



Answer by josgarithmetic(39792) About Me  (Show Source):
You can put this solution on YOUR website!
The units digit, u
The tens digit, t

system%28t=u-2%2Ct%2Bu=12%29

substituting for t,
%28u-2%29%2Bu=12
2u-2=12
u-1=6
u=7
and then
t=5

The number is 57.