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JAMB Mathematics 1978 Question 48

Question 48

Fractions, Decimals and Approximation

Add the same number to the numerator and denominator of 3/18. If the resulting fraction is 1/2, then the number added is

  1. A.13
  2. B.14
  3. C.15
  4. D.12
  5. E.11.
Show the answer and explanation

Answer: D (12)

Explanation

(3 + x)/(18 + x) = 1/2 gives 6 + 2x = 18 + x, so x = 12.