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WAEC Mathematics 2005 Question 39

Question 39

Mensuration of Solids

The total surface area of the walls of a room 7 m long, 5 m wide and x m high is 96 m2. Find the value of x.

  1. A.2/3
  2. B.2
  3. C.4
  4. D.8
Show the answer and explanation

Answer: C (4)

Explanation

The four walls have area 2(7x) + 2(5x) = 24x = 96, so x = 4.