Question

3. 

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.1200
D.1800​

Answer 1

Step-by-step explanation:

Area of floor + Area of ceiling =Area of four walls

⇒lb+lb=2×h×(l+b), where l, b, h are the length breadth and height of the hall

⇒lb=h×(l+b)

⇒15m×12m=h×(15m+12m)

⇒h=

27

15×12

m=

3

20

m

∴ Volume of the hall =l×b×h=15m×12m×

3

20

m=1200m

answer: c) 1200

hope it helps u.

Answer 2

Answer:

sorry but the formula is l×b×h