5 divided by 2/3= 7 1/2 because with division you multiply by the reciprocal. So it’s 5/1 x 3/2 = 15/2 which can be simplified as 7 1/2.
2/3 divided by 5= 2/15 because you do the same thing with multiplying by the reciprocal. Do 2/3 x 1/5 which equals 2/15. 2/15 can’t be simplified.