Question

A cylindrical jug that carries 5 ℓ of water when it is filled to the brim, has a height of 20 cm

Answer 1

$$V=\dfrac{\pi d^2}{4}h$$

$$d=2\sqrt{\dfrac{V}{\pi h}}$$

Given $V=5000{cm}^3, h=20cm$

$$d=2\sqrt{\dfrac{5000{cm}^3}{\pi (20cm)}}=10\sqrt{\dfrac{10}{\pi}}cm\approx17.841cm$$