I have a practice dosage calculation test and I am not sure one of the problems

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I was able to get all of the other problems right except for this one: Order : 500 mg Available: 1g Directions: reconstitute with 2.5ml normal saline to yield 3 ml worth a concentration of 330 mg/ml. I know that the correct answer is 1.5 ml. The only equation I could come up with to get this answer was 1000 mg/3 ml X 500 mg/x ml which would be available/yield X order/x ml.Is this the correct way to set up this problem or am I missing something. If anyone can help it will help me out with my test anxiety:confused:

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order : 500 mg (dose desired)

available: 1g (dose on hand)

directions: reconstitute with 2.5ml normal saline to yield 3 ml (amount the dose on hand comes in) worth a concentration of 330 mg/ml. (all the rest of the information about reconstitution is unnecessary to the calculation of the dosage for this particular problem!)

500mg
(dose desired)
/1 gram
(dose on hand)
x 3 ml
(amount the dose on hand comes in)
x 1 gram/1000 mg
(conversion factor)
=
1.5 ml
(amount to give)

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