13 @ 6" lay and 100 square feet per 3 bundles
Shingles I assume. Standard grade 3 bundles per 100 sq. ft. 3x9=27 Heavy duty have 4 bundles per 100 sq. ft. 4x9=36 You will need some for the starter row and the cap.
236.25
420
420 ft = 128m
There are 420/7 = 60
420 decimeters is 4200cm
420 / 7 = 60
19.7" * 19.7" = 388.09 sq inches= 388.09/144 = 2.70 sq ft approxSo to cover 420 sq ft you will require 420/2.70 = 155.84 = 156 tiles.However, that is the mathematical answer and assumes that the shape is "well-behaved" and that there is no wastage (almost all offcuts are used).19.7" * 19.7" = 388.09 sq inches= 388.09/144 = 2.70 sq ft approxSo to cover 420 sq ft you will require 420/2.70 = 155.84 = 156 tiles.However, that is the mathematical answer and assumes that the shape is "well-behaved" and that there is no wastage (almost all offcuts are used).19.7" * 19.7" = 388.09 sq inches= 388.09/144 = 2.70 sq ft approxSo to cover 420 sq ft you will require 420/2.70 = 155.84 = 156 tiles.However, that is the mathematical answer and assumes that the shape is "well-behaved" and that there is no wastage (almost all offcuts are used).19.7" * 19.7" = 388.09 sq inches= 388.09/144 = 2.70 sq ft approxSo to cover 420 sq ft you will require 420/2.70 = 155.84 = 156 tiles.However, that is the mathematical answer and assumes that the shape is "well-behaved" and that there is no wastage (almost all offcuts are used).
There are .42 amps in 420 mA. Equation 420/1000 = .42 amps
420 mm = 16.5 inches
420 centimeters is 13.78 feet.
420 feet = 128.016 meters.
420 ÷ 15 = 28