WAEC Mathematics 2019 Question 8

Question 8

Number Bases

If 23y = 1111two, find the value of y.

  1. A.4
  2. B.5
  3. C.6
  4. D.7
Show the answer and explanation

Answer: C (6)

Explanation

1111two = 8 + 4 + 2 + 1 = 15. So 2y + 3 = 15, giving y = 6.