17. How many rectangular tiles 10 cm by 7 cm willmbe required to cover

1.	17. How many rectangular tiles 10 cm by 7 cm willmbe required to cover a floor 14 m by 12and what will be the cost at R 5 per hundredtiles?
Answer» Area of floor Af = length * breadth = 1425/2 = 175 m^2 = 1750000 cm^2 Area of tile At = lengthbreadth = 107 = 70 cm^2 Let number of tiles required is n Then,nAt = Afn = 1750000/70 = 25000 Number of tiles required is 25000Cost of tiles = 5*25000/100 = Rs 1250

17. How many rectangular tiles 10 cm by 7 cm willmbe required to cover a floor 14 m by 12and what will be the cost at R 5 per hundredtiles?

Answer»

Area of floor Af = length * breadth = 14*25/2 = 175 m^2 = 1750000 cm^2

Area of tile At = length*breadth = 10*7 = 70 cm^2

Let number of tiles required is n

Then,n*At = Afn = 1750000/70 = 25000

Number of tiles required is 25000Cost of tiles = 5*25000/100 = Rs 1250