If Jane painted 2 walls with 3 cans of paint, how much paint would she have used on one wall? The answer would be 3/2, since you just divide the number of cans of paint by the number of walls. You would solve this problem in the same way, but it gets a little more complicated with fractions.
To make it easier, start by turning the number of walls into an improper fraction with no whole number. 2 1/3 can be converted to a fraction by multiplying the denominator (3) by the whole number (2), then adding this to the numerator. 2*3+1 = 7, so the result is 7/3. That's equivalent to 2 1/3, the number of walls Jane painted.
Now you want to divide 2/3 by 7/3, to determine the amount of paint used on each wall. When you divide by a fraction, that's the same thing as multiplying by its reciprocal. The reciprocal of 7/3 is 3/7, so you end up with (2/3) * (3/7). Simplify this, and you will end up with how many cans of paint Jane used for each wall. (Note: The answer is a fraction!)