A child is playing games with empty soda cups. There are three sizes: small, medium, and large. After some experimentation, she discovered she was able to measure out 160 ounces in the following ways:

1) 2 small, 2 medium, 4 large

2) 2 small, 6 medium, 1 large

3) 5 small, 1 medium, 3 large

Determine the size of the cups.