Question

the perimeter of a rectangular field is 2.4m less than 2/5 of the perimeter of a square if the perimeter of the square is 40m find the cost of fencing rectangular field at the rs 3.50 per meter

Answer 1

Answer:

perimeter of the rectangle= [(2/5)*perimeter of square] - 2.4

= (2/5)*40 - 2.4 = 16-2.4 = 13.6 m

cost of fencing = 13.6*3.5 = 47.6 rupees

Answer 2

Answer:

The cost of fencing rectangular field at the rs 3.50 per meter is 47.6 rupees.

Step-by-step explanation:

Given,the perimeter of a rectangular field is 2.4m less than 2/5 of the perimeter of a square and perimeter of the square is 40 m.

Let perimeter of the rectangle field is x m.

Now according to question,

$\frac{2}{5} \times 40 - x = 2.4$

Here 2/5 is multiplying by 40,

$2 \times 8 - x = 2.4 \\ 16 - x = 2.4 \\x = 16 - 2.4 \\ x = 13.6$

Therefore perimeter of the rectangular field is 13.4 m.

Now it is given that cost of 1 m fencing is 3.50 rupees

now by Unitary method,

Cost of 13.6 m fencing is

$(3.50 \times 13.6) = 47.6 \: rupees$

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