The number of houses that can be served by a water pipe varies directly as the square of the diameter of the pipe. A water pipe that has a 10-centimeter can supply 40 houses.

a) How many houses can be served by a water pipe that has a 40-centimeter diameter?

b) What size of water pipe is needed for a new subdivision of 1960 houses?

**Solution:-**

** **

a) A water pipe that has a 40-centimeter diameter can supply 640 houses.

b) A water pipe that a 70 –centimeter diameter can supply 1960 houses.