Half of 2.4 L given in mL is 1200 mL
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After 48 minutes, two half-lives have passed for Cu-60 (24 min * 2 = 48 min). Each half-life reduces the amount of Cu-60 by half, so after 48 minutes, only 1/4 of the original 4 mg sample would remain, which is 1 mg.
24 tsp 1 cup = 48 teaspoons 1 teaspoon = 0.02 cup
1 pint = 16 fluid ounces 1.5 pints = 24 fluid ounces
There are 24 teaspoons in half a cup. 1/2 cup=4oz. 1oz=30mL. So, 4oz=120mL. 1tsp=5mL. 120mL (4oz) divided by 5mL (1 tsp) = 24 teaspoons.
A half gallon is equivalent to 64 fluid ounces.