Some manipulations with vague quantities consist in an aggregation of vague amounts where the resulting aggregated quantity (in our case a sum of vague summands) is expected to be (almost) crisp. The aim of this contribution is to analyze and briefly discuss various approaches to this problem which can be supported by the elementary theory of fuzzy quantities. The analysis is focused on the possibility of achieving the desired sum, on the fuzzy set theoretical methods applicable to this model, and also to the limits of regulation of some fuzzy summands during the aggregation process