Grades 1-2 Video Solutions 2019-2019Levels12prob19

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There are 10 camels in a zoo, either Bactrian (two humps) or Dromedary (one hump), totaling 14 humps. Assuming all camels are initially Dromedary with 10 humps, converting a Dromedary camel to a Bactrian adds a hump. By converting successively, four conversions of Dromedary to Bactrian achieve 14 humps. Thus, 4 Bactrian camels with two humps each and 6 Dromedary camels achieve the total: 4 Bactrian camels contribute 8 humps, and 6 Dromedary camels contribute 6 humps, totaling 14. Therefore, there are 4 Bactrian camels, answer D.