6 cups divided by 2/3 cups. To multiply by a fraction, multiply by the reciprocal. so 6 divided by 2/3 is the same as 6 times 3/2.
View that as 6/1 times 3/2.
6 times 3 = 18.
1 times 2 = 2
Your answer is 18/2 which is simplified by dividing 18 divided by 2, which is 9. So he can share with 9 friends.