Question

How many tiles with dimention 5 n 12 cm will be needed to fit a region whose length n breadth is (a)100 n 144 cm (b)70 n 36 cm?

Answer 1

Given length of tile = 12cm
Breadth = 5cm
Length of the region = 144cm
breadth = 100cm
No.of tiles needed to cover = Area of region/Area of 1 tile
                                            = (144 × 100)/(5 × 12)
                                            = 14400/60
                                            = 240
∴No.of tiles required to cover a region of dimensions 100 cm and 144cm  is 240

b) length of the region = 70cm 
breadth of the region = 36cm
No.of tiles = Area of the region / Area of 1 tile
                 = (70 × 36)/(5 × 12)
                 = 2520/60
                 = 42
∴No.of tiles required to cover the region of dimensions 70cm and 36cm   is 42