Question

Construction of a building: Raman is a contractor; he is constructing a building of many floors. The building has interesting design on each floor it has open space thus number of rooms decreases as we go up. If number of bricks for construction of a room is 1500. The number of bricks required for ground floor is 30,000 on 1st floor it is 27,000 on 2nd floor It is 24,000 …… and so on . Question :-18 (A) Find the total number of rooms on ground floor. *

2 points

20 Rooms

24 Rooms

23 Rooms

25 Rooms

Construction of a building: Raman is a contractor; he is constructing a building of many floors. The building has interesting design on each floor it has open space thus number of rooms decreases as we go up. If number of bricks for construction of a room is 1500. The number of bricks required for ground floor is 30,000 on 1st floor it is 27,000 on 2nd floor It is 24,000 …… and so on . Question : 18 (B) Find the number of rooms on 5th floor. *
2 points
13 Rooms
12 Rooms
11 Rooms
14 Rooms​

Answer 1

Answer:

24 rooms

11rooms

Step-by-step explanation:

............

...........

Answer 2

Answer:

Number of rooms in ground floor = 20

Number of rooms in 5th floor = 10

Step-by-step explanation:

      Given that bricks for 1 room = 1500

  the number of bricks used in ground floor =30,000

  number of rooms in ground floor = $\frac{total bricks in 1st floor}{bricks for 1 room}$=   $\frac { 30000 }{1500}$ = 20

  bricks used in 1st floor = 27000

   number of rooms in 1st floor = $\frac{27000}{1500}$ = 18

   number of bricks used in 2nd floor = 24,000

   number of rooms in 2nd floor =  $\frac{ 24000}{1500}$ =16

  number sequence of rooms from ground to up = 20, 18, 16, ....

  the rate of decreasing rooms per floor is 2

 therefore number of rooms in 3rd floor = 14

                 number of rooms in 4th floor = 12

                number of rooms in 5th floor = 10 rooms