Proofreader requires 100 approvals+rejections, so your distance away is (100 - approvals - rejections).
Q&A about the site for enthusiasts and scholars of mythology and folklore
declare @UserId int = ##UserId##
SUM(CASE WHEN VoteTypeId = 2 THEN 1 else 0 end) Approvals,
SUM(CASE WHEN VoteTypeId = 3 THEN 1 else 0 end) Rejections,
(100 - SUM(1)) AS VotesStillNeeded
WHERE UserId = @UserId
AND VoteTypeId in (2, 3)