Jane and Eric each have some seashells. Jane has $5$ seashells for every $7$ seashells Eric has. If Eric gives Jane $6$ seashells, the number of seashells that Jane has to the number of seashells Eric has will be in the ratio of $$11:13$$. How many seashells do they have in total? 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Proportions->Complex Ratio Problems