Telangana Police Constable Prelims 2015 Paper

Three workers A, B and C paint a house. We want to find in how many days the work can be completed by A, B and C working together. Observe the following statements:
(I) A and B can complete the work in 20 days
(II) B and C can complete the work in 16 days
(III) A and C can complete the work in 15 days Then