1- How many milliliters of water must be added to 145 ml of 45% salt solution to produce a 30% solution?
2-How many ml of 50 percent acid should be added to pure acid to make 70 ml of 55 percent acid?
3-How many ml of 50 percent acid should be added to pure acid to make 80 ml of 85 percent acid?
4-How many ounces of pure salt must be added to 8oz of 30% salt solution to produce a 60% solution? (Pure salt is 100%Round your answer to the nearest hundredth of an oz