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A rectangular lot whose perimeter is 500 feet is to be fenced along four sides. An expensive fencing along the lot`s length costs $21 per foot and an inexpensive fencing along side width costs only $60 per foot. The total cost of the fencing along the four sides comes to $7500. Find the length of the rectangular lot in feet units.

Sagot :

Answer:

L = 150 feet

Step-by-step explanation:

2L + 2W = 500

21(2L) + 6(2W) = 7500

42L + 12W = 7500

21(2L + 2W = 500)

= 42L + 42W = 10,500

- 42 L + 12W = 7500

= 30W = 3000

W= 100

2L + 2W = 500

2L + 2(100) = 500

2L + 200 = 500

2L = 300

L= 150

(note: error po kapag 60$ yung nasa given, baka po 6$ talaga sya)

L = 150 feet