What percentage of an average person's body weight is made up of water and how many pounds does that equate to?

The average percentage of water in an adult's body is between 50% and 60% 

To calculate the number of pounds of water in an average person's body, you can use the following formula:

                   Water weight (pounds)=

$$\frac{\text{Total body weight (pounds)}\times 0.6}{14}$$

For example, if an adult weighs 150 pounds, their water weight would be:

$$\text{<span style="background-color: white;"><b><span style="font-size: small;">Water weight (pounds)</span></b></span>}<span\; style="background-color:\; white;"><b><span\; style="font-size:\; small;">=</span></b></span>\frac{\mathrm{<span\; style="background-color:\; white;"><b><span\; style="font-size:\; small;">150</span></b></span>}<span\; style="background-color:\; white;"><b><span\; style="font-size:\; small;">\times </span></b></span>\mathrm{<span\; style="background-color:\; white;"><b><span\; style="font-size:\; small;">0.6</span></b></span>}}{\mathrm{<span\; style="background-color:\; white;"><b><span\; style="font-size:\; small;">14</span></b></span>}}<span\; style="background-color:\; white;"><b><span\; style="font-size:\; small;">\approx </span></b></span>\mathrm{<span\; style="background-color:\; white;"><b><span\; style="font-size:\; small;">58.33</span></b></span>}\text{<span style="background-color: white;"><b><span style="font-size: small;"> pounds</span></b></span>}$$

So, an average person weighing 150 pounds would have approximately 58.33 pounds of water in their body. Keep in mind that this is an approximation, as the actual percentage of water in a person's body can vary depending on factors such as age, sex, and fitness level.