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# How many tiles whose length and breadth are 12 cm and 5 cm respectively will be needed to fit in a rectangular region whose length and breadth are respectively: (a) 100 cm and 144 cm (b) 70 cm and 36 cm.

Q 12.     How many tiles whose length and breadth are 12 cm and 5 cm respectively will be needed to fit in a rectangular region whose length and breadth are respectively:

(a) 100 cm and 144 cm
(b) 70 cm and 36 cm.

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Given that,
the length and breadth of the tiles are 12 cm and 5 cm

Therefore, the area of the tiles
= length $\times$ breadth
= 12 cm $\times$ 5 cm
= 60 cm2

Now, (a) For 100 cm and 144 cm rectangular region,
Area of region =  length $\times$ breadth
= 14,400 cm2

Therefore, the number of tiles needed = $\frac{14,400}{60}=240$ tiles

(b)  For 70 cm and 36 cm rectangular region,
Area of region =  length $\times$ breadth
= 70 cm $\times$ 36 cm
= 2520 m2

Required number of tiles = $\frac{2520}{60}=42$

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