The answer would be 11 2/3
How?
Well, firstly, in an equation that says something like 35/3 mostly means divide.
Now you can divide in a fraction form as well.
First see how much 3's can fit into 35. You try all the answers to the multiplication table of 3 until you find a number that can be multiplied by 3 to make 35, or just get the closest to it.
For instance, the closest number to hit 35 would be 11. Note, that the number always has to be lower than 35, but not higher.
3 × 11 would be 33
So you put 11 as your mixed number.
11 35/3
since it's 35/33, there can be numbers added to simplify the number. 2 can be added to 33 to make 35, so the overall answer to the question would be
11 2/3
Hope this helped! :D