Question

15. A rectangular field is of 25 m long and 21 m wide. A 2.5 m wide strip is levelled all
around it at the rate of 3 5 per square metre. Find the cost of levelling the strip.​

Answer 1

Answer:

Step-by-step explanation:

Here we need to get the area covered by the strip.

To get this we should understand that we have two rectangles.

One surrounding the other at a distance of 2.5 m.

The dimensions of the bigger triangle is given by :

Length = 2.5 + 2.5 + 25 = 30m

The width = 2.5 + 2.5 + 21 = 26m

The area of the inner rectangle is :

21 × 25 = 525 m^2

The area of the outer rectangle is :

30 × 26 = 780 m^2

The area of the strip is :

780 - 525 = 255

The cost of levelling the strip is :

Rs 5 per square meters.

The total cost will be :

5 × 255 = Rs 1275