0.5x22=11. To get answers like that, all you have to do is divide 11 by anything and then that number times the number you divided 11 by will give you the answer. So like 11 divided by 4 is 2.75. So 4x2.75=11.
To answer this question and you will use exponents.
When you fold your paper three times, it is represented as two cubed or 2^3.
When you for your other sheet of paper two times, it is represented as two squared or 2^2.
Put Both of these together and you have 8+4 which equals 12.
It will take 12 layers of paper.
Glorious Revolution of 1688-89 and his letter Concerning Toleration 1689