Question

A rectangular field has its length and breadth in the ratio 5:3.It's area is 3.75 hectares.The cost of fencing it at Rs.5 per meter is a)4000 b)400 c)500

Answer 1

Answer:

Let the length and breadth of rectangle field is 5x and 3x respt and area =3.75 hectars

We know that 1 hectare=10000 sq metes

Then area 37500 sq m

Then Area 5x×3x=37500

⇒15x

2

=37500

⇒x

2

=2500

⇒x=50

Then length =5×50=250 m and breadth =3×50=150 m

Than perimeter of rectangle field =2(L+B)=2(250+150)=800 m

Then cost of fending =800×5=4000 Rs

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Answer 2

Answer:

Step-by-step explanation:

I hectare =10000m^2

3.75 hectare = 37500m^2

Ratio of length and breadth is 5:3

Let their common factor be x

then length =5x and breadth = 3x

Area of rectangular field is length ×breadth

37500=5x×3x

37500=15x^2

x^2=37500/15

x^2= 2500

x=50m

Length =5x = 5×50=250m

Breadth =3x=3×50=150m

Total perimeter = 2(l+b)

=2(250+150)

=2(400)

= 800m

Cost of fencing per meter = Rs. 5

Total perimeter = 800m

Total cost of fencing = 800×5

= Rs.4000

Option C is correct

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