### Home > PC3 > Chapter 7 > Lesson 7.2.4 > Problem 7-120

The amount of water evaporating from a conical container varies directly with the exposed surface area (circular region) of the water in the cone. The height of the cone is

How fast is the water evaporating when the container is full?

Determine the radius when the cone is filled.

Set up and solve a proportion relating the area with the rate of evaporation.

How fast is the water evaporating when it is half full? (Reminder

.)When the cone is full, it has

m ^{3}of water in it.

What is the volume of water in the cone when it is half full?Calculate

when the cone is half full. Then set up a proportion with area and evaporation rate similar to the one in part (a).