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Question 3

The length, breadth, and height of a room are 825 cm, 675 cm, and 450 cm respectively. Find the longest tape which can measure the three dimensions of the room exactly.

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Solution

HCF of two or more number is the highest number which divides the given numbers exactly.
The measurement of longest tape = HCF of 825 cm, 675 cm, and 450 cm.
Factors of 825 = 3×5×5×11
Factors of 675 = 3×5×5×3×3
Factors of 450 = 2×3×3×5×5
HCF = 3×5×5=75 cm
Therefore, the longest tape which can measure the three dimensions of the room exactly is 75 cm.


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