Assuming you use the standard 4" depth, you will need at least 1.75 cubic yards.
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Two squares.
The square feet of a 14ft x 30ft area is420ft2
10x12 room
12 ft x 10 ft x .333 ft (4 in) = 39.96 cu ft. You need enough concrete for 40 cubic ft.
Assuming that's 30 ft X 30 ft X 6 inches, you will need 20 cubic yards