Question

the answer is 1800 in my book answer key.

so please explain with sum​

Answer 1

Answer:

Each room have 18 rooms and 5 floors so we will multiply 18×50 = 90

There are 20 switches in each room so we will multiply

90×20 = 1800

Answer 2

Answer:

1500 is right answer.

Step-by-step explanation:

Total no of storeys in building = 5

Number of rooms in one storey = 18

Number of rooms in five storey = 90 rooms

Number of switches in one room = 20 switches

Number of switches in 90 rooms = 90×20

switches

Therefore , Number of switches in 90 rooms =

90×20 switches = 1800 switches

Ok