Pavan lives on the 16th floor of a building. He came down 9 floors and collected his Maths textbook from his friend Karan. Later, he went up along with Karan to Goutham's house which is 12 floors above Karan's for group work. If Goutham lives on the topmost floor of the building, how many floors does the building have?
37
Since Pavan came down 9 floors from 16th floor to meet Karan,
Karan lives on the (16 - 9) = 7th floor.
Similarly,
Goutham lives on (7 + 12) = 19th floor.
Therefore, the building has 19 floors.