Question

Find the cost of fencing a rectangular field of length 20m
and width 15m at the rate of Rs 75 per meter.​

Answer 1

Answer:

Given :-

l=20 m

b=15m

rate, ₹75/m

perimeter of a rectangular field = 2(l+b)

2×(20+15)

2×35

70m

cost:-

1m=₹75

70m=?

by cross multiplication

70×75

₹5259

Answer 2

Given :

• Length of the rectangular field = 20 m
• Breadth of the rectangular field = 15 m
• Rate of fencing the field = Rs. 75

To find :

• Cost of fencing the field

Concept Used :

→ Formula to calculate area of rectangle :-

• Area of rectangle = l × b

where,

• l = length
• b = breadth

To find the cost of fencing the field :-

• Firstly, find the area of the field by using the formula of area of rectangle.
• Then multiply the area of the field by the rate the resultant value will be the required answer.

Solution :

Using formula,

• Area of rectangle = l × b

Substituting the given values,

⇒ Area = 20 × 15

⇒ Area = 300

Area of the rectangular field = 300 m²

⇒ Cost of fencing the field = Area × Rate

⇒ Cost = 300 × 75

⇒ Cost = 22,500

★ Cost of fencing the field = Rs. 22,500

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Know MorE :

• Perimeter of reactangle = 2(l + b)
• Diagonal of rectangle = √l² + √b²
• Area of square = side × side
• Perimeter of square = 4 × side
• Diagonal of square = √2a
• Total surface Area of cuboid = 2(lb + bh + hl)
• Volume of cuboid =  length × breadth × height
• Perimeter of cuboid = 4 (length + breadth + height)
• Total surface area of cube = 6 × side²
• Volume of cube = side³
• Perimeter of cube = 12 × side