A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and…
2019
A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is:
- A.
720
- B.
900
- C.
1800
- D.
1200
Attempted by 4 students.
Show answer & explanation
Correct answer: D
Floor + ceiling area = 2 x 15 x 12 = 360. Four walls area = 2h(15 + 12) = 54h. Thus 54h = 360, so h = 20/3. Volume = 15 x 12 x 20/3 = 1200.