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Australian AMC 2017 - Intermediate Question 17

AMC AUSTRALIA · Australian AMC 2017 - Intermediate

Question 17

The numbers 18, p, 13, q, 15, r, 7 have a mean of 11. The mean of p, q and r is:
  1. 7
  2. 8
  3. 9
  4. 11
  5. 12