51 is 33 1/3 of what number?

1700, just use the inverse operation. The problem would look like this (not inverse operation) x : 33 1/3 = 51

All you have to do is multiply the two numbers.

51 x 33 1/3 = 1700

Now plug it back in and check

1700 : 33 1/3 does indeed equal 51.