SSC GD Constable 18 Nov 2021 Shift 2 Paper

A can complete $\;{2}/{3}$ of a work in 10 days and B can complete $\;{4}/{5}$ of the same work in 8 days. They work together for 5 days. The remaining work is completed by C alone in 6 days. In how many days C alone can complete 75% of the same work?