Câu hỏi:
A professional fisherman caught 30 fish during a 5-day tournament. Each day, he caught three more fish than the day before. How many fish did the fisherman catch on the first day?
Đáp án:
He didn't catch any fish the first day, but he caught 3 on the second day, 6 on the third day, 9 on the fourth day and 12 on the fifth day.
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