A cylinder which is 18cm in diameter and 30cm high is ½ full of water. Find the new height of water when a stone of volume 480cm³ is carefully lowered into the cylinder
current height of water = 15 cm
π(9^2)(h) = 480 , where h is the height added to the water in the cylinder
h = 480/(81π) = 1.88 cm
new height = 15 + 1.88 = 16.88 cm