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Answer

Correct Option is 8

Solution:The flat which has rooms of area 81 ft2 is on the even number floor. There are two possibilities. The flat having each room area of 216 ft2 is above the floor having 8 rooms. The area of each room of Flat A on 2nd floor is 9 ft2 less than the area of each room of Flat A on the third floor. Rooms in Flat A on first floor is more than the rooms in flat B on the first floor. Total number of rooms on the first floor is 6.

The flat having area of each room 324 ft2 is just below the flat having each room area of 54 ft2. The flat having area of each room is 162 ft2 is on odd number floor but this flat is not Flat B. From these conditions, case-2 will be eliminated, because each flat has a different number of rooms. The final arrangement is-
 

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