Question

A storage tank is in form of cube. When it is full of water,the volume of water is 42.875m cube

Answer 1

Volume of cube = 42.875 m^2

let the side = x

$volume = 42.875 \\ \\ {x}^{3} = 42.875 \\ \\ x = \sqrt[3]{42.875} \\ \\ x = 3.5m$

Length of cube = 3.5m

(For calculation: 4^3 is 64 and 3^3 is 27.... So cube root of 42.875 lies between 3 and 4. Unit digit is 5, So best guess is 3.5... 3.5^3 = 42.875)