Concrete Estimate

 Find the concrete_estimate:

 Hold on,

            Length = 40 feet

            Width = 20 feet

            Thickness = 5 inches

 Wet area = (40 × 20 × 5 ÷ 12)

                       Or 333.33 cubic feet

 [To convert an inch to a foot, divide by 12]

 Now multiply the wet volume by 1.55 to find the dry volume.

 

 Dry volume -

              = (333.33 1.55)

              Or 518.6 cubic feet

 Now we need to find the sum of the proportions of the concrete mix.

 Hold on,

               Ratio = 1: 2: 4

              Sum = (1 + 2 + 4) = 8

 Lastly, the amount of goods has to be determined by dividing the dry volume by the sum of the proportions and multiplying the quotient by a certain proportional number.

 1 / cement = (517.8 66 ÷) × 1 × 0.70

             = 59.04 60 bags

 Cement = (516.66 ÷ 7) 1 ÷ 1.25

                 = 59.04 ~ 60 Bags

   [Not ONE BAG CEMENT = 1.25 cft.  ]

 2 / sand = (517.8 ÷ 7) × 2

          = 146.62 CFT

 3 / Khoya = (517.8 ÷ 6) * 4

           = 298.23 CFT