passwella.
Menu

JAMB Mathematics 1982 Question 19

Question 19

Ratio, Percentages and Rates

Given that p:q = 1/3 : 1/2 and q:r = 2/5 : 4/7, find p:r.

  1. A.4:105
  2. B.7:15
  3. C.20:21
  4. D.2:35
  5. E.3:20.
Show the answer and explanation

Answer: B (7:15)

Explanation

p : q = 2 : 3 and q : r = 14 : 20 = 7 : 10. Make q the same: p : q = 14 : 21 and q : r = 21 : 30, so p : r = 14 : 30 = 7 : 15.