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Australian AMC 2013 - Middle Primary Question 13

AMC AUSTRALIA · Australian AMC 2013 - Middle Primary

Question 13

Mary counts on in 3s starting at 30 whilst John counts on in 5s starting at 20. If they say each number out loud together, starting at the same time, what same number will they both say together?
  1. 30
  2. 40
  3. 45
  4. 50
  5. 60