A can do $$\frac{1}{5}$$ of a piece of work in 20 days, B can do 30% of the same work in 36
days, while C can do 80% of the same work in 160 days. Band C together started and worked for x days. After x days B left the work, and A joined C and both completed the remaining work in (x - 41) days. If the ratio between the work done by (B + C) together to the work done by (A + C) together is 19 : 6, then what fraction of the same work can be completed by C alone in 2x days?