Achemist has one solution that is 80% acid and another solution that is 30% acid. how much of the first (80%) solution is needed to make a 400 l solution that is 62% acid?

Situation: . find the substance's half-life, in days. round your answer to the nearest tenth. a 11 gram sample of a substance that's used to treat thyroid disorders has a k. value of 0.1247. enter the correct answer n - noekt done no - initial mass (at time t = 0) n - mass at timet k a positive constant that depends on the substance itself and on the units used to measure time t= time, in days