Question

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 ceiling at the rate of Rs 7.50 per m^2.​ ?​

Answer 1

Answer:

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Length, breadth and height of a room are 5 m, 4 m and 3 m.

Area of four walls of the room =2h(l+b)

=2×3(5+4)

=6(9)

=54 sq m

Area of the ceiling =l×b

=5×4

=20 sq cm.

Total area of the four walls and the ceiling of the room

=54+20

=74 sq cm

Cost of white washing = Rs 7.50 per sq m

Total cost of white washing =74×7.50= Rs 555

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Answer 2

$\huge \underline{ \underline \mathtt \color{blue}answer}$

$\rm{\underline{Given:-}}$

• Length (l) of room = 5 m

• Breadth (b) of room = 4 m

• Height (h) of room = 3 m

$\bf \large\underline{Solution:-}$

It can be observed that four walls and the ceiling of the room are to be white washed.

Total area to be white washed = Area of walls + Area of ceiling of room

$\large{\rm{= 2lh+2bh+lb}}$

$\large{\rm{=2×5×3+2×4×3+5×4}}$

$large{\rm{=30+24+20}}\large{\rm}$

$\large{\rm{=74}}$

$\sf{Area = 74\:m²}$

Also,

Cost of white washed per m² area = Rs. 7.50 (given)

Cost of white washed 74 m² = Rs. (74×7.50)

$\bf \large\underline{Rs\:555 }$