BRAIN TEASER 1:
1.- How many times does the digit 3 appear between 1 and 50?
BRAIN TEASER 2:
2.- How many times can you substract 3 from 39?
BRAIN TEASER 3:
3.- Júlíus Björnsson won the competition of the Strongest Man in the World, yet there is one thing (that weighs virtually nothing) that he finds impossible to hold for more than a couple of minutes. What is it?