Question

the Length breadth and height of a hall are 5 M 6 m and 7 M respectively the hall has 1 door of area 1 metre into 0.5 m find the cost of painting the walls only the walls @ rupees 90 per square

Answer 1

find the area of the hall by putting the formula 2(bh×hl)
subtract the area of the door by the area of hall
then find the cost

Answer 2

Hope that helped you out.
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Thanks.