Marco has a jug with 3 7/2 ounces of juice. he wants to use some small cups to pass out samples of the juice each cup can hold 2 1/2 ounces of juice. how many cups can marco fill with juice samples?

If the jug holds only 3 7/2 ounces [13/2 ounces) of juice, the number of 2 1/2 oz. cups that can be filled is

13

  2
 =  13/5 cups, or 2 3/5 cups.
 5
---
 2

I suspect you have copied down your numbers incorrectly.  Try again.

3cm and 6 and 9 cm that a possibility of that question