Question

A tank is 20m in length, 15m in breadth and 4m
in depth. Find the cost of cementing its floor and
the four walls at the rate of 50 per square metre.
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Answer 1

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Given that :-

Length of tank = 20m

breadth of tank = 15 m

height of tank = 4m

Now , we have to find the area of four walls as well as the area of base .

That means , we have to find :-

Lateral surface area + area of base .

So ,

2 ( l + b ) * h + lb

By putting value of l , b and h , we get ,

2 ( 20 + 15 ) * 4 + 20 * 15

= 8 * 35 + 300

= 280 + 300

= 580 m² .

Now ,

Cost of 1m² = Rs 45.50

Cost of 580 m² = Rs ( 45.50 * 580 )

= Rs 26390 ( by calculating ) .

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Answer 2

Step-by-step explanation:

4 walls + floor = LSA + area of base

= 2(l+b)h + lb

= 2(20+15)4 + (20×15)

= 280 + 300

= 580 m²

Area of 4 walls and floor is 580 m²

Cost

1 m² = 50 Rs.

580 m² = 580 × 50

= 29000

The cost is 29000 Rs.

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