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A hospital pharmacist wants to use three lots of zinc oxide ointment containing 45 %, 30%...

A hospital pharmacist wants to use three lots of zinc oxide ointment containing 45 %, 30% and 5% to prepare a 10% ointment. How many proportional parts of the 5% ointment will be needed? Report numerical value as a whole number.

PLEASE MAY I HAVE A SOLUTION STEP BY STEP

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Answer #1

Zinc oxide ointment maintaining = 45%, 30%, 5%

Desired ointment = 10%

Allocation gride formula =

Desired ointment - available ointment

10% - 5%

5%.

So here

2 proportion of 5% of zinc ointment gives 10% proportion.

That is,

2× 5%

Gives

10% it is our desired strength.

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