I have to assume several things. First that you mean 12 feet by 12 feet. Second that you mean 16 inches by 20 inches. Third that there is no spacing between the pavers (this last assumption is not a good ond, usually there are spaces).
12 feet x 12 = 144 inches
---- 144 in / 16 in = 9 pavers long
---- 144 in / 20 in = 7.2 pavers wide so there must be spacing use 7 pavers
7x9 = 63 total pavers.
OR YOU CAN ALTERNATE THE PAVERS TO FORM A PATTERN. Use the 16 for length beside one turned to get 20 length beside it. This yields 36 inches.
Play with the pattern on paper until you get one that you like.
216
272 Get 300 to be safe.
One should do it!
144
One should be more than enough!
576 should do it.
216
272 Get 300 to be safe.
One should do it!
Depend on the size of the pavers.
144
One should be more than enough!
264 of them. Get extra for breakage.
If both items are measured in inches or feet, the half is the answer. Without more info. this cannot be answered.
144 Get 160 to be safe.
72 Get 80 to be safe.
The number of pavers you will need will be basd on the size of your patio. You should measure the square feet of your patio.