Posted by **Bob** on Sunday, May 18, 2008 at 9:23am.

How do I set this up to solve?

In 2004, the Diabetic Express charged $27.06 for a vial of Humulin insulin and $34.39 for a vial of Nevolin Velosulin insulin. If a total of $1565.57 was collected for 50 vials of Insulin, how many vials of each type were sold?

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