You need to prepare an ointment containing 10% Zinc Oxide. You have ointments containing 20%, 15%, 5% and 2.5% Zinc Oxide. How much of each ointment do you need to make 220g of the 10% ointment?
Two of the ointments have a concentration higher than the required concentration; the other two have a concentration below the required concentration. You can pair up the source ointments in two ways:
Paring 1
20% and 5% ointments
15% and 2.5% ointments
20% and 5% ointments
15% and 2.5% ointments
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Pairing 2
20% and 2.5% ointments
15% and 5% ointments
20% and 2.5% ointments
15% and 5% ointments
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