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in Perimeter and Area of Plane Figures by (51.6k points)
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The length of a rectangular field is thrice its breadth and its perimeter is 240 m. The length of the field is

(a) 80 m (b) 120 m (c) 90 m (d) none of these

1 Answer

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by (48.6k points)
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Best answer

(c) 90 m

Because,

Let us assume the Breadth of the rectangular field be x m.

Let us assume the length of the rectangular field is thrice its breadth be 3x m

Then,

Perimeter of the rectangular field = 2(l + b)

= 240 = 2(x + 3x)

= 240 = 2(4x)

= 240 = 8x

= x = 240/8

= x = 30

∴The length of the rectangular field is 3x = 3 × 30 = 90 m

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