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JAMB Mathematics 1999 Question 17

Question 17

Inequalities

Tope bought x oranges at N5.00 each and some mangoes at N4.00 each. If she bought twice as many mangoes as oranges and spent at least N65.00 and at most N130.00, find the range of the values of x.

  1. A.4 ≤ x ≤ 5
  2. B.5 ≤ x ≤ 8
  3. C.5 ≤ x ≤ 10
  4. D.8 ≤ x ≤ 10
Show the answer and explanation

Answer: C (5 ≤ x ≤ 10)

Explanation

She spends 5x + 4(2x) = 13x naira. 65 ≤ 13x ≤ 130 gives 5 ≤ x ≤ 10.