The least number of square tiles

The least number of square tiles required to pave the ceiling of a room 525 centimetre long and 378 centimetre broad is:
525 सेंटीमीटर लंबे और 378 सेंटीमीटर चौड़े कमरे की छत को ढकने के लिए आवश्यक वर्गाकार टाइलों की न्यूनतम संख्या कितनी हैं?

450 150 178 380

Detailed Solution & Logic

Correct Answer:

450

Length = 525 cm, Breadth = 378 cm
HCF of 525 and 378 = 21 cm
Tiles along length = 525/21 = 25
Tiles along breadth = 378/21 = 18
Total tiles $ = 25 \times 18 = 450 $
Answer = 450

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