An agricultural field is in the form of a rectangle having length X1 meters and breadth X2 meters. (X1 and X2 are variables). If X1 + X2 = 40 meters, then the area of the agricultural field will not exceed which one of the following values?

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  1. 400 sq m
  2. 300 sq m
  3. 200 sq m
  4. 80 sq m

Answer (Detailed Solution Below)

Option 1 : 400 sq m
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Detailed Solution

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Given:

Length of rectangle (X1) + Breadth of rectangle (X2) = 40 meters

Formula used:

Area of rectangle = X1 × X2

To maximize the area, for a fixed perimeter, the rectangle should be a square.

X1 = X2 when maximized

Calculations:

X1 + X2 = 40

⇒ X1 = X2 = 20 meters (when area is maximized)

Area = X1 × X2

⇒ Area = 20 × 20

⇒ Area = 400 sq. meters

∴ The correct answer is option (1).

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