The Collaborative International Dictionary of English v.0.48:

Resolvable \Re*solv"a*ble\ (r?-z?lv"?-b'l), a. [See Resolve,
   and cf. Resoluble.]
   Admitting of being resolved; admitting separation into
   constituent parts, or reduction to first principles;
   admitting solution or explanation; as, resolvable compounds;
   resolvable ideas or difficulties.
   [1913 Webster]

WordNet (r) 3.0 (2006):

resolvable
    adj 1: capable of being solved; "such problems are perfectly
           solvable" [syn: solvable, resolvable]
    2: capable of being settled or resolved; "all disputed points
       are potentially resolvable"; "a resolvable quarrel"

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "resolvable":
   answerable, ascertainable, capable of solution, convertible,
   decipherable, decodable, determinable, doable, explainable,
   explicable, modifiable, open to solution, soluble, solvable,
   transformable, transitional, transmutable, workable