The formula of getting the volume of a regular prism is L x W x H = V. Given: V: 7.35m3 L: 4.2 m H: 50 cm (Convert this to meters) = 0.5m W: ? L x W x H = V 4.2 x W x 0.5m = 7.35m3 2.1m2 x W = 7.35m3 <-- Divide both sides by 2.1m2 The result would be W= 3.5m So the width of the pond is 3.5m Hope this solution helps you!