How do you get 4 oz with a 3 oz cup and a 5 oz cup?

1. Fill the 3 cup, and dump it into the 5 cup.

2. Fill the 3 cup, and dump it into the 5 cup.

3. Whatever cannot fit into the 5 cup is equal to 1 cup (3 + 3 - 5 = 1) 1. Fill the 3 cup, and dump it into the 5 cup.

2. Fill the 3 cup, and dump it into the 5 cup.

3. Whatever cannot fit into the 5 cup is equal to 1 cup (3 + 3 - 5 = 1) 1. Fill the 3 cup, and dump it into the 5 cup.

2. Fill the 3 cup, and dump it into the 5 cup.

3. Whatever cannot fit into the 5 cup is equal to 1 cup (3 + 3 - 5 = 1)