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The sum of the digits of a positive 2-digit number is 12. The units digit is 3 times the tens digit. Find the number

User Janco
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Let's denote the tens digit of the number as "x" and the units digit as "y". According to the given information:

The sum of the digits is 12:
x + y = 12
The units digit is 3 times the tens digit:
y = 3x
To find the number, we need to find the values of x and y that satisfy both equations simultaneously.

From equation (2), we can substitute the value of y in equation (1):

x + 3x = 12
4x = 12
x = 3

Substituting the value of x back into equation (2):

y = 3 * 3
y = 9

Therefore, the number is 39.
User Harel
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