Question

Each floor of a high rise building is fitted with 20 doors. There are 12 floors in each building. There are 25 such buildings in a complex. Calculate the total number of doors fitted in the complex.
A. 2400
B. 3000
C. 6000
D. 5000

Answer 1

Hint: To solve this question, first of all we have to find the number of doors in one floor. Then find the number floors in a building. When we get the number of floors in a building, we can calculate the number of doors in the building. In the same way we have to find the number of buildings in a complex and then find the total number of floors fitted in the complex.

Complete step-by-step answer:
First of all, we have to find the number of doors on one floor.
So, it is given that there are 20 doors on a floor. That is,
Number of doors on one floor = 20
Then, we have to find the number of floors in a building.
It is also given that there are 12 floors in each building. That is,
Number of floors on one building = 12
Therefore, number of doors in one building = $20\times 12=240$doors
Now, we have to find the number of buildings in a complex.
It is given that there are 25 buildings in one complex. That is,
Number of building in one complex = 25
Therefore, the total number of doors in the complex $=240\times 25=6000$
So, the total number of doors fitted in the complex is 6000

So, the correct answer is “Option C”.

Note: The students can also directly multiply the values and find the answer, this would be very helpful while appearing for the competitive exams. Sometimes, students make silly mistakes by adding the values rather than multiplying.