Answer: 6 yards by 14 yards by 0.5 yard
Explanation:
Given that the concrete will fill a space that is a right rectangular prism that is 18 feet wide, 42 feet long
The cubic feet of the space =
242 × 18 × 6/12= 378 cubic ft
Given that 1 foot = 12 inches and 1 yard = 3 feet
6 yards by 14 yards by yard will give
( 6×3 )×(14 × 3)×(0.5×3) = 378 cubic ft
the dimensions of this space must be equal to the concrete dimensions space that is a right rectangular prism