Question

the length and breadth of a rectangle are in the ratio 3:4, if the perimeter of the rectangle 140m,find the area of the rectangle.Also find the cost of ploughing it at the rate of $21.50per square m.​

Answer 1

Answer:

Area = 1200 m²

Cost for ploughing the field = $ 25800

Step-by-step explanation:

Let the length and breadth of the rectangle be 3x and 4x respectively.

So the perimeter of the rectangle = 2 ( l + b ) = 140

2 ( 3x + 4x) = 140

7 x   = 70

x  = 10 m

So the length and breadth become 30 and 40 respectively.

Area of rectangle = l × b

= 30 ×  40

= 1200 m²

Cost of ploughing = area × 21.50

= 1200 × 21.50

= $ 25800

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