Question 300176
The sum of the digits of a two-digit number is 12.  The units digit is three times the tens digit.  Find the number.

I think one part of the equation is:  x + y = 12

I think the other part of the equation might be 3 (10x + y)
Instead of x and y:
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t + u = 12 (tens and units)
u = 3t
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--> 39