A patient must take 40 units of insulin every day. If there are 100 units in each mL of insulin, how many mL will the patient need to take every day?
0.25
0.4
1.5
2.5
0.4
Rationale: The patient must take 0.4 mL of insulin every day. This is calculated by dividing 40 units by 100 units = 0.4 mL.
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