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WAEC Mathematics 2016 Question 17

Question 17

Mensuration of Solids

The volume of a pyramid with height 15 cm is 90 cm3. If its base is a rectangle with dimensions x cm by 6 cm, find the value of x.

  1. A.3
  2. B.5
  3. C.6
  4. D.8
Show the answer and explanation

Answer: A (3)

Explanation

⅓ × 6x × 15 = 30x = 90, so x = 3.