Hi There!
To solve this problem you have to multiply fractions. Since the chef has 6 cups of berries and he has 2/3 cups right now, you have to multiply 6 * 2/3. After you multiply you should get 4. Four is the amounts of deserts you can make.
So, 6 * 2/3 is equal to 4, you can make 4 deserts !
Hope This Helps! :)