To figure this out, divide 3/5 by 2/3. In a similar way, if you were being asked how many groups of 2 were in 6, wouldn't you divide 6 by 2?

When you divide fractions, you can also multiply by the reciprocal of the second fraction:

Now we can multiply across:

There are 9/10 groups of 2/3 in 3/5.