You would need 320 pavers to cover 160 square feet with 6x9 pavers, assuming each paver covers 0.5 square feet.
The speaker size 5x7 and 6x8 refers to the original speaker mountings in a automotive environment. Some car manufacturers use 5x7 speakers with corresponding mounting holes and 6x8 speakers just correspond respectively Having worked as a car audio installer, I find that 5x7 speakers will fit in a 6x8 speaker opening, and you would have to take out the 6x8 speaker holes that are usually found in a 5x7 speaker with the holes horizontally on each end of the oval shaped speaker. You could use a hex saw blade to do this and then break it off using a pair of pliers. OK you know your cars speaker size, next is how much power you will use to drive it. If you are just replacing a stock speaker with an upmarket model, go for at least 100watts max (50rms) two way speaker. If you plan to use the speakers with an external amplifier ( meaning another amp mounted in your boot / trunk area, then go for a higher rating speaker and always check the mounting depth so you have clearance for your window winder mechanisms. 5X7 and 6x8 speakers will fit in those holes respectively, but 6x9 speakers are larger in length.
6x9=54.
You would need 320 pavers to cover 160 square feet with 6x9 pavers, assuming each paver covers 0.5 square feet.
Multiply the two dimensions to get the area. The calculation will give you 54 square feet.
At minimum, 427. Depending on the exact geometry, you might need more than that.
The answer will depend on the units used for 6X9. It also depends on the shape of the 225 square foot area: a circular area will require a lot more stones to be shaped and, therefore, a lot more wastage.
54 sq m
The answer depends on the units used for 6*9 and since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
6 If we assume that the pavers are 6 inches by 9 inches, then its area is 6*9 = 54 square inches. 54 sq.in. = 54/144 = 0.375 square feet each. 36 sq.ft / 0.375 sq.ft. = 96 pavers (nett). In practice you may need a few extra to allow for breakages, out-of- squareness, etc.
In order to calculate the area of a rectangle you must multiply one dimension by the other.For example,the sum for a rectangle that is 6x9 inches is 6x9 which amounts to 54 square inches.
1/5 cubic feet of airspace
Assume they are 9 inch x 6 inch pavers. The area of each paver is 9*6/144 = 3/8 sq feet Area to be covered = 144 square feet So number of pavers required = 144/ (3/8) = 384 That is the minimum number required if the area to be covered is "well behaved". If the area is not an exact number of pavers long/wide, of if there are curves you will have to cut some pavers and, unless all the offcuts can be used, you will require more than 384.
54 sq. in.