Mathematical puzzles

Puzzles, situation puzzles and recreational mathematics.

situation puzzles and recreational mathematics. Neuron juice
 
 
 

Neuron juice.

The important thing is not to stop questioning. (Albert Einstein.)

  

 

Riddle.

19.- How do we get to twenty , adding one of us, nineteen ?

 


 

Solution

Roman number is twenty XX if we add a one in the middle we have XIX.