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WAEC Mathematics 2010 Question 24

Question 24

Linear and Simultaneous Equations

A rectangle has length x cm and width (x − 1) cm. If the perimeter is 16 cm, find the value of x.

  1. A.3½ cm
  2. B.4 cm
  3. C.4½ cm
  4. D.5 cm
Show the answer and explanation

Answer: C (4½ cm)

Explanation

2(x + x − 1) = 16, so 2x − 1 = 8 and x = 4½ cm.