7. A room is 7 m 20 cm long and 5 m 20 cm broad. If square tiles have to be laid in such a way that an exact us
tiles fit in and no tile has to be cut, what is the greatest length of the side of square tiles?
8. Three pieces of timber, 42 m 49 m and 63 m long, have to be divided into planks of the same length. Wh
greatest possible length of each plank?
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Answer:
7. Length of tile
=7m 20 cm
=720 cm
Breadth of tile
=5m 20 cm
=520 cm
To file greatest lenght of tile , we will findg the HCF of 720 and 520
HCF = 40
So no. of tiles = 40
Area of 1 tile=936 cm sq
Side of 1 tile is 234 cm
8th is same .Take HCF of all
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