Question

find the cost of the painting wall 12 m long and 4 m in height at the rate of $200 per meter​

Answer 1

Answer:

length of wall = 15m

breadth of wall=4m

as the wall has to be painted we will find it's area

area =lenght *breadth

=15*4 = 60m^2

cost of painting wall per meter = ₹200

cost of painting wall per 60meter sq = 200*60

=₹12000

Step-by-step explanation:

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Answer 2

Solution

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Let h be the height.

Rate of covering the floor with mat = Rs 25 per square metre

Total cost for floor = RS 2700

Area of the floor = (total cost)/ (cost per meter)

Area of the floor =

25

2700

=108m

2

Breadth = (area of the floor) / Length =

12

108

= 9m

Length of a wall = 12 m

Rate of painting the four walls of a room = Rs 30 per square metre

Total cost = RS 7560

Again,

Area of walls = (total cost)/ (cost per meter) =7560/30=252m

2

Now,

Area of 4 walls = 2(Length of walls × Height of walls) + 2(Breadth of walls × Height of walls)

252=2(12×h)+2(9×h)

252=24h+18h

252=42h

h=6

⇒ Height is 6 m

Therefore dimensions of the room are :12m×9m×6m

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