Question

If three rectangular holes of 1.5m x 0.3m x 200mm are placed on the wall,

a.) How many cubic meters of concrete needed to build the wall?

b.) What is the total volume of the rectangular solid holes? 

Answer 1

Concrete needed = Volume of hole x 3

Volume = 1.5 x 0.3 x (200/1000)

Volume = 1.5 x 0.3 x 0.2 = 0.09m³

Concrete needed = 0.09 x 3 = 0.27 m³

Total volume of rectangular solid holes is

= 1.5 x 0.3 x (200/1000) x 3 = 0.27 m³