Flying Fungi - by Augustine

7 moulds found in one classroom, and the cleaner said that it would take 5 days to get one mould removed. 

1 mould = 5 days to get removed
2 moulds = 10 days to get removed
3 moulds = 15 days to get removed
4 moulds = 20 days to get removed
5 moulds = 25 days to get removed
6 moulds = 30 days to get removed
7 moulds = 35 days to get removed

For the 7 moulds to get removed, it will take 35 days.