Two-digit number

I am a two-digit number less than 20. When I divided by three, then you get the rest 1 and when you divide me by four you get also rest 1. What number am I?

Correct result:

x =  13

Solution:

$$\begin{gathered} a=(13-1)\mathrm{/}3=4 \\ b=(13-1)\mathrm{/}4=3 \\ x=3\cdot 4+1=13 \end{gathered}$$

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