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
[tex]\bf a+b+c=2\implies a+2b=2\qquad b=\frac{5}{8}a\implies a+2\cdot \cfrac{5a}{8}=2
\\\\\\
a+\cfrac{5a}{4}=2\impliedby \textit{let's multiply both sides by 4}
\\\\\\
4a+5a=8\implies 9a=8\implies \boxed{a=\cfrac{8}{9}\ lb}
\\\\\\
b=\cfrac{5}{8}\left( \cfrac{8}{9} \right)\implies \boxed{b=\cfrac{5}{9}\ lb}[/tex]
