Question 149186
The key to this problem is to determine the volume of a single tablespoon (in metric units).
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Reference:
http://www.joyofbaking.com/USMetricVolumeEquiv.html
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1 tablespoon = 15 ml
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Your proportion is then:
Let x = grams of drug in a teaspoon
5/500 = x/15
x = (5*15)/500
x = 75/500
x = 0.15 grams (or, 150 milligrams)