Since there are over 300 days of sunshine in Colorado, my son-in-law rigged up a solar-powered "water heater" for his kiddie pool
in his backyard. He used 250 feet of 1/2 inch diameter hose filled with water (see photos below).
How many gallons of water are being heated?
![](../../mgifs/gifs23/pool.jpg)
Solution to the Problem:
The answer is 2.55 gallons of water.Think of the rolled up hose as a cylinder 250' long with a diameter of 1/2".
Then use the formula for the Volume of a cylinder to solve.
You must covert 250 feet to inches by multiplying by 12.
Then you must use the conversion formula to convert cubic inches to gallons of water.
![](../../mgifs/gifs23/pool2.gif)
Correctly solved by:
1. Veena Mg | Bangalore, Karnataka, India |
2. Maddy Woodson |
Redlands Middle School, Grand Junction, Colorado |
3. Ivy Joseph | Pune, Maharashtra, India |
4. Colin (Yowie) Bowey | Beechworth, Victoria, Australia |