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you have an order for zinc oxide 10% ointment but only have a 5% and 20%...

you have an order for zinc oxide 10% ointment but only have a 5% and 20% ointment on hand you will use ______ g of the 20% ointment to achieve the disired concentration  

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Answer #1

We have to add 1.5g of 20% ointment in the 1g of 5% ointment to get the desired 10% ointment.

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