About This Set
These 25 questions use the plain method for each type: adding water or one part, removing then adding, mixing two mixtures, the price of a mix, the alligation cross, mixing for profit, and removal and replacement. They are not in topic order, so for each one decide first whether a part stays fixed, a mean is given, or the same amount is taken out and put back. Allow about 25 minutes and attempt all of them before checking. Under 20 right means going back to the topic section for each type you missed, before Practice Set 2.