JAMB Mathematics 2010 Question 2

Question 2

Number Bases

Find r, if 6r78 = 5119.

  1. A.5
  2. B.2
  3. C.3
  4. D.6
Show the answer and explanation

Answer: C (3)

Explanation

6r78 = 384 + 8r + 7 and 5119 = 405 + 9 + 1 = 415. So 8r = 24 and r = 3.