Assuming that there is no wastage, you would require a minimum of 85 pavers. The exact number depends on the shape of the area to be paved, whether or not you are prepared to use offcuts in the form of mosaic and the skill of the person laying the pavers
A 12x12 inch paver is one square foot. So you would need 240 square feet.
128; each paver is half a square foot.
A paver, or paving stone, is ... well, "paving stone" ought to be enough of a definition. They're usually made of clay (like bricks) or cement.
In theory the answer is 240 tiles but this assumes that the area is "well behaved" and, if not, that you are prepared to use all the offcuts to fill bits in mosaic-style. A shape which in 17 inches wide, for example, will require a lot more pavers.
The diagonal of the paver is about 848.53mm
A 18x18 paver is 324 sq. inches. A sq.ft. is a 144 sq. inches. So 600 sq.ft x 144 sq inches = 86,400 sq. inches. So take the sq.inches which is 86,400 divide by the sq. inches of the paver 324 is equal to around 267 pavers you will need.
Well, one 12 ft * 12 ft paver will cover 144 sq feet so one will be enough. On the other hand, if they were 12 centimetres by 12 centimetres then you would need 133781 pavers.
It depends on the units of measurement for the paver and that is information that you have chosen not to share. One paver, measuring 12 ft x 12 ft will cover 144 square feet and so will be more than enough to cover 50 sq ft.A:12 x 12 is one square foot so you would need 50 of them for 50 square feet.
If each paver is 6 x 3 then it has an area of 18 square feet. You will need exactly 25 of these to cover an area of 450 square feet.
A good way is to pressure wash the bricks. This will remove the moss and clean the bricks at the same time. It's good that you pressure wash your fences and outdoor walls regularly.
Assuming the question is about pavers that are 12 inch x 12 inch, then each paver covers 1 sq foot and so 150 pavers would be required. However, this also assumes that there is no wastage at all and that there are no breakages.
Each paver is 12" x 12" or 1 square foot. So, 200 ft2 * (1 paver/ 1 ft2) = 200 pavers