Question

How many tiles of dimension 22.5 cm*10cm*7.5cm can be painted if the paint is just sufficient for the surface area 2812.50 m sq

Answer 1

Solution:-
Length of one tile = 22.5 cm, breadth of one tile = 10 cm and height of one tile = 7.5 cm
Surface area of the tile = 2(L*B + B*H + HL)
= 2(22.5*10 + 10*7.5 + 7.5*22.5)
= 2(225 + 75 + 168.75)
= 2*468.75
= Surface area of one tile = 937.50 sq cm
Total surface area = 2812.50 sq m (Given)
As 1 sq m = 10000 sq cm 
So, 2812.50 × 10000 = 28125000 sq cm
Total number of tiles that can be painted = Total surface area/Surface area of one tile
= 28125000/937.5
= 30000 Tiles
Answer.

Answer 2

the answer is 3000 not 30,000.