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Question

A door of dimensions 3m * 2m is on the wall of dimension 10m *10m. Find the cost of painting the wall if rate of painting is rs 2.50 per sq.m


Solution

WE ARE ACTUALY PAINTING THE AREA OF THE WALL,BUT WE DO NOT PAINT THE DOOR,
THE AREA OF THE WALL INCLUDING THE DOOR IS 10*10=100 M SQUARE
THE AREA OF THE DOOR
=3*2=6 M SQUARE
SO THE AREA OF THE WALL ALONE EXCLUDING THE DOOR IS
=100-6=94 M SQUARE
SO THE AREA OF THE PORTION TO BE PAINTED=94 M SQUARE
IT IS SAID THAT IT TAKES 2.50 RS TO PAINT 1 M SQUARE AREA,
SO IT TAKES 94*2.50=235 RS TO PAINT THE WALL

Mathematics

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