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The perimeter of a rectangular lawn is 24m. If the area of the lawn is...

Mathematics
JAMB 1990

The perimeter of a rectangular lawn is 24m. If the area of the lawn is 35m\(^2\), how wide is the lawn?

  • A. 5cm
  • B. 7m
  • C. 12m
  • D. 14m
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Correct Answer: Option B
Explanation

Perimeter. of a rectangle = 2(L + B) = 24

Area of a rectangle = L x B = 35

From above, L + B = 12

L = 12 - B

L x B = 35(given)

12 - B)B = 35

12B - B\(^2\) = 35

B\(^2\) - 12B + 35 = 0

B\(^2\) - 7B - 5B + 35 = 0

B(B - 7) - 5(B - 7) = 0

(B-5)(B -7) = 0

B = 5m OR 7m 

 


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