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WAEC Mathematics 2026 Question 48

Question 48

Progressions

The first term of an Arithmetic progression is 20. If the fifth term is four-fifth of the third term, find the common difference.

  1. A.1
  2. B.−1
  3. C.−5/3
  4. D.5/3
Show the answer and explanation

Answer: C (−5/3)

Explanation

20 + 4d = ⅘(20 + 2d) gives 100 + 20d = 80 + 8d, so 12d = −20 and d = −5/3.