Question

To reduce 16 ounces of a 25% solution of antiseptic to a 10% solution, how much distilled water should a nurse add?
12 oz
24 oz
36 oz

Answer 1

similar to last one. figure out how much you have to begin with.
in this case 25% of 16 is 4

Answer 2

now you add x ounces of water, you still have 4 ounces of antiseptic, but now you have \(16+x\) ounces of liquid. you want this to be 10% antiseptic, so set
\[.10\times (16+x)=4\] and solve for x

Answer 3

24oz

Answer 4

yes again