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प्रश्न
The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost
of white washing the walls of the room and the ceiling at the rate of Rs. 7.50 m2.
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उत्तर
Total area to be washed = `lb+2 (l+b)h`
Where length `(l)=5m`
Breath (b)= 4m
Height (h)=3m
`∴("Total area to be white washed") =(5xx4)+2(5+4)xx3`
`=20+54=74m^2`
Now,
Cost of white washing `1m^2 is Rs 7.50`
=Rs.555
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