Question

A tank is 20m in length 15m in breadth 4m in depth find the cost of cementing its floor and the four walls at the rate of Rs.50 per square metre​

Answer 1

Answer:

• Rs 29000 is the total cost in cementing .

Step-by-step explanation:

According to the Question

It is given that,

• Length, l = 20m
• Breadth ,b = 15m
• depth, h = 4m
• Cost of cementing = 50 per square metre

we have to calculate the cost of cementing its floor and its four walls.

Calculating Area of Floor :

$:\implies$ Area of Floor = 20×15

$:\implies$ Area of Floor = 300m²

Calculating CSA of Room :

$:\implies$CSA of Room = 2(l+b)h

$:\implies$ CSA of Room = 2(20+15)4

$:\implies$CSA of Room = 2(35)4

$:\implies$CSA of Room = 70×4

$:\implies$CSA of Room = 280m²

Total area = Area of Floor + Area of Four walls

Total Area = (300+280)m²

Total Area = 580m²

Now, calculating the total cost of cementing .

$:\implies$ Total Cost of Cementing = 580×50

$:\implies$ Total Cost of Cementing = Rs 29000

• Hence, the total cost of cementing is 29000 .

Answer 2

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Length of a tank = 20m

Breadth of a tank = 15m

Depth/Height of a tank = 4m

Cost of Cementing at the rate of ₹50 = ?

$\space$

Area of floor = l × b

Area of floor = 20 × 15

Area of floor = 300 m^2

$\space$

Area of walls = 2(lh + bh)

Area of walls = 2(20 × 4 + 15 × 4)

Area of walls = 2(80 + 60)

Area of walls = 160 + 280

Area of walls = 280 m^2

$\space$

Total area to be cemented = Area of (floor + wall)

Total area to be cemented = (300 + 280)m^2

Total area to be cemented = 580 m^2

$\space$

Cost of Cementing per m^2 = ₹50

Cost of Cementing 580m^2 = ₹50 × 580

Cost of Cementing 580m^2 = ₹29,000

Hence, the cost of cementing its floor and the four walls is ₹29,000.

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