passwella.
Menu

WAEC Mathematics 2025 Question 14

Question 14

Algebraic Expressions

Make r the subject of the relation: 1/p = b/t + c/r

  1. A.r = pct/(t − pb)
  2. B.r = pct/(t + pb)
  3. C.r = pc/(t − pb)
  4. D.r = pc/(t + pb)
Show the answer and explanation

Answer: A (r = pct/(t − pb))

Explanation

c/r = 1/p − b/t = (t − pb)/(pt), so r = pct/(t − pb).