Three parcels weigh 2 pounds. two parcels weigh the same. the lightest weight is 5/8 pound lighter than the heaviest weight. how much do each of the parcels weigh

Let's say the parcels are "a, "b" and "c"

so.. hmm two of them weigh the same,... let's say b and c, that means c = b

so, and they all weight 2lbs, so
a + b + c = 2
or 
a + b + b = 2
a + 2b = 2

let's say the lightest is "b", and weights 5/8 less than "a", so
b = (5/8)a

You can use a calculater and divide the minutes by the $$, hope that you