12. A farmer has ten baskets of eggs containing 12, 13, 14, 16, 18, 19, 22, 24, 29 and
34 eggs respectively. Some baskets have chicken eggs while other baskets have
duck eggs. He sells one basket and found that the number of remaining
chicken eggs is three times the number of the remaining duck eggs. How many
eggs were in the basket he sold?
【Solution】
The total number of eggs in the nine baskets the farmer still has must be a multiple of
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