passwella.
Menu

JAMB Mathematics 1979 Question 11

Question 11

Variation

x is directly proportional to y and inversely proportional to z. If x = 9 when y = 24 and z = 8, what is the value of x when y = 5 and z = 6?

  1. A.5/6
  2. B.11
  3. C.3⅗
  4. D.2½
  5. E.1⅕.
Show the answer and explanation

Answer: D (2½)

Explanation

x = ky/z. 9 = 24k/8 gives k = 3, so x = 3 × 5/6 = 2½.