Jane + Mo = 528
Jane = 3×Mob( she has 3x more parcels)
Plug Jane = 3Mo in the first equation:
3mo + mo = 528
4mo = 528
4/4mo = 528/4
mo = 132
If they both had the same amount they would have 528/2 which is 264
264 parcels - Mo's 132 parcels = 132
Jane would give mo 132 parcels
Hope it helps :)