13. The figure shows a container in the shape of an inverted right pyramid which contains some water. The area of the top surface of the container is 63 cm² and the area of the top surface of the water is 28 cm² - Find
(i) the depth of the water if its volume is 336 cm³
(ii) the ratio of the depth on the water to the height of the container,
(iii) the capacity of the container. ​