Question

how many square tiles of side 16 centimetre will be required to pave the floor of rectangular room 6.4 metre × 5 metre

Answer 1

Side of square = 16 cm =16÷100= 0.16 m
Length of rectangle = 6.4 m 
breadth of rectangle = 5 m

area of rectangle = area of N no. of square tiles
N = area of rectangle ÷ area of square tiles
N = 6.4×5÷0.16²
N = 32÷0.0256
N = 1250

 Hence 1250 tiles are required to pave the floor of rectangular room