maths
posted by sweety on .
A floor is covered by 800 tiles measuring 10 cm square.How many square tiles of side 8 cm would be needed to cover the same floor?

area covered by 10 by 10 tiles = 800 x 100 or 80000 cm^2
each 8 by 8 covers 64 cm^2
so number of smaller tiles = 80000/64 = 1250 tiles