![A fill pipe can fill a tank in 20 hours, a drain pipe can drain a tank in 30 hours. If a system of n pipes](https://www.gkseries.com/blog/wp-content/uploads/thumbs_dir/A-fill-pipe-can-fill-a-tank-in-20-hours-a-drain-pipe-can-drain-a-tank-in-30-hours.-If-a-system-of-n-pipes-qlkxgazoial01esdcg8vhefzf1w0z3zql280bckd5s.jpg)
A fill pipe can fill a tank in 20 hours, a drain pipe can drain a tank in 30 hours. If a system of n pipes (fill pipes and drain pipes put together) can fill the tank in exactly 5 hours, which of the following are possible values of n (More than one option could be correct)? ...
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