Answer: 11/12
Explanation:
 1. To solve this problem you can transform the mixed numbers given in the problem to fractions, as you can see below:
 3 2/3=(3*3+2)/3=11/3
 2 3/4=(4*2+3)/4=11/4
 2. Now you must make the substraction of the fraction:
 11/3-11/4=11/12
 3. Therefore, the answer is 11/12