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.
Length =825cm=3 5 5 11
Breadth =675cm=3 3 3 5 5
Height =450cm=2 3 3 5 5
Longest tape = HCF of 825,675, and 450= 3 5 5
=75cm
Therefore, the longest tape is 75cm.