Because if you do, one trick to know is this:
Whatever the second fraction in the division equation is can be flipped and turned into a multiplication problem. For example, if you are dividing 13 by 3/5, you will get the same answer by multiplying 13 by 5/3. If you are dividing 20 by 6 2/3, (which you can convert to 20/3), you now can multiply 20 by 3/20 to get the answer.
Another way to think of it is the exact reverse rule for multiplying fractions. You divide by the numerator and multiply by the denominator (instead of multiplying by the numerator and dividing by the denominator). For example, 6 divided by 5/8 = 6/5*8, = 1.2*8, = 9.6 (If it helps you to do the multiplication first [like 6*8/5], you can do that because fractions only involve multiplication and division in this type of question so the operations are interchangeable).
Or 20 divided by 20/3 as I mentioned earlier: you can divide 20 by 20 and multiply the result by 3, thus making 20/20*3, = 1*3, = 3.
Hope this was helpful.
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