To make one yard of concrete from 80# bags you will need about 40-45 bags. Each bag is about .67 or 2/3 cubic foot. you will need 27 cubic feet to make 1 cubic yard. Cheaper to have a redimix truck deliver, and a lot less work.
1
A British pound coin is 22.5 millimetres in diameter (0.89 inches) and is 3.15 millimetres thick (0.124 inches).
55
81
one (1) cubic yard of concrete four inches thick will cover 80 sq. feet. 85 yards x 81 = 6885 sq. feet.
How many square yards in a 20x18 feet 3 inches thick
go to any search. and type in concrete calculater
Concrete driveways are no less than 3.5 inches to 4.5 inches.
4 To 6 inches
A British pound coin is 22.5 millimetres in diameter (0.89 inches) and is 3.15 millimetres thick (0.124 inches).
90 sq yds at 4" thick.
About 162sf.
should be at lest 4 inches
55
81
10 yards
7.1
If it is 4 inches deep/thick, 2 cubic yards. If it is 6 inches deep/thick, 3 cubic yards.