JAMB Mathematics 2009 Objective — Question 2
Question 2 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2009 Objective paper, with the correct answer and a full explanation.
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If 55(base r) + 52(base r) = 77(base 10), find x (the base r)
- A. 5
- B. 6
- C. 7Correct
- D. 10
Explanation
Converting to base 10: 5r+5 + 5r+2 = 77. 10r+7=77. 10r=70. r=7.
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