Respuesta :

JoshEast
Using the formula

P₁V₁ = P₂V₂    (where P is percentage and V is volume in pounds)

∴ [tex] (\frac{15}{100}) * (20) = ( \frac{12}{100}) * (x)[/tex]  (where x is the unknown volume being found)
[tex] \frac{15}{100} * 20 * \frac{100}{12} = x[/tex]
x  = 25

∴ In order for only 12 % of salt to be percent you need to have 25 pounds of water but since you already have 20 pounds of water and 15 % salt, you only need to find how much more pounds of water to add which is 5 (25 - 20 = 5)

5 pounds of water must be added.

What is Boyle's law?

The volume of a gas at constant temperature varies inversely with the pressure exerted on it.

Using Boyle's law

P1V1= P2V2

15/100* 20 = 12/100* V2

300= 12* V2

V2= 300/12

V2 =25

But since there is already 20 pounds of water and 15 % salt

So, only 5 pounds needed more.

Learn more about this concept here:

https://brainly.com/question/84262

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