JAMB Mathematics 2018 Objective — Question 9
Question 9 of 39 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2018 Objective paper, with the correct answer and a full explanation.
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A bag contains 3 MTN cards, (2x−3) Etisalat cards and 3x GLO cards. If the probability of picking an Etisalat card at random from the bag is 1/5, how many GLO cards are in the bag?
- A. 3
- B. 9Correct
- C. 6
- D. 12
Explanation
Total cards = 3+(2x−3)+3x = 5x. P(Etisalat) = (2x−3)/5x = 1/5 → 5(2x−3)=5x → 10x−15=5x → x=3. GLO cards = 3x = 9.
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