20 ml is about 4 teaspoons
or a large table spoon is about 15ml so you need 1 and a third table spoons
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The drop has been standardized in the metric system to equal exactly 0.05 milliliters. So 20 ml = 400 drops in 60 minutes = 62/3 drops per minute = 9 seconds between drops.
20ml
20ml
10-20ml
~60 drops solution: 20 drops/mL * 3 mL = 60 drops