Question

the length, breadth and height of a room are 6m, 4m, and 3m respectively. find the cost of white washing the four walls pf the room at the rate of rs 12per m3. the room has a enterance door measuring 2.5×1m which is not to be white washed.​

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The length,  breadth and height of a room  are 6m, 4.5m and 3m respectively, find the cost of white washing the walls of the room and the ceiling at the rate of Rs.8 per m2  

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ANSWER

Area to be whitewashed = area of four walls + area of ceiling

Formulas to be noted :−

Area of four walls =2 ( length + breadth ) × height

Area of ceiling = area of rectangle = length × breadth

In the question, length of the room =6m

breadth of the room =4.5m 

height of the room =3m

On the basis of formulas given above :−

Area of four walls =2(6m+4.5m)x3m

Area of four walls =2(10.5m)x3m

Area of four walls =21mx3m

Area of four walls =63m2

Area of ceiling =6m×4.5m

Area of ceiling =27m2

Therefore, area to be whitewashed =63m2+27m2

Area to be whitewashed =90m2

Cost of whitewashing = rate at which area is being whitewashed × area to be whitewashed 

Cost of whitewashing =Rs8/m2×90m2

Cost of whitewashing =Rs8×90

Cost of whitewashing =Rs.720.

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toppr

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