WAEC Mathematics 2020 Question 6

Question 6

Number Bases

If 101two + 12y = 23five, find the value of y.

  1. A.8
  2. B.7
  3. C.6
  4. D.5
Show the answer and explanation

Answer: C (6)

Explanation

101two = 5 and 23five = 13, so 12y = y + 2 = 8, giving y = 6.