SOLUTION: I am a 2-digit number. The sum of my digits is 6. My units digit is 2 times my tens digit. Who am I?

Question 528257: I am a 2-digit number. The sum of my digits is 6.
My units digit is 2 times my tens digit. Who am I?

Answer by Edwin McCravy(20055) (Show Source): You can put this solution on YOUR website!
I am a 2-digit number.

Let t = your tens digit
Let u = your units digit

The sum of my digits is 6.

    t + u = 6

My units digit is 2 times my tens digit.

        u = 2t

So you have this system of equations:

    t + u = 6
        u = 2t

Substitute 2t for u in t + u = 6

   t + 2t = 6

       3t = 6
     
        t = 2

u = 2t = 2(2) = 4

Who am I?

You are the number 24. 

Edwin

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