MATH
posted by LILY on .
I have about 30 questions of this, so I need to understand the process. Please make it as detailed as possible! Thank you!
Q: To reduce 32 grams of a 25% solution of antiseptic to a 10% solution, how much distilled water should a pharmacist add?
A: Equation: _____
Answer is: _____

Something usually stays the same, in your case it would be the amount of antiseptic which would be 25% of 32 g or 8 g.
So let's add x g of distilled water, so now we have (32+x) g.
10% of that is still 8 g of the antiseptic.
so equation : 10/100(x+32) = 8
solve that to get x = 48 g