Post-UTME Mathematics 2019 Objective — Question 42
Question 42 of 50 from the Post-UTME Screening (Post-UTME) Mathematics 2019 Objective paper, with the correct answer and a full explanation.
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The mean of twelve positive numbers is 3. When another number is added, the mean becomes 5. Find the thirteenth number
- A. 29Correct
- B. 26
- C. 25
- D. 24
Explanation
Sum of 12 numbers = 36; sum of 13 numbers = 65; 13th number = 65-36 = 29.
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