Question

a tile measures 10 cm × 10 cm how many such tiles are required to cover the wall of 4 m × 2.5 m

Answer 1

area of a tile = 10×10 = 100cm²
area of wall = 4×2.5 = 10m² = 1000cm²

now let the number of tiles used to cover the wall be n

therefore
1000 = n×100
1000/100 = n
n = 10

therefore 10 tiles are required to cover the wall.
hope it helps

Answer 2

HERE,

Tile measures 10cm×10cm
area =10*10=100sq.cm

Area of wall=4×2.5=10sq.m=1000sq.cm

$no. \: of \: tiles = \frac{area \: of \: wall}{area \: of \: tile}$

$no. \: of \: tiles = \frac{1000}{100}$

$no. \: of \: tiles = 10$

therefore,
the number of tiles required are 10.

hope this helps!!!