数学题：学校组织春游，组了几条船让学生们划。若每条船坐3个人，则空了2个人的位置；若每条船坐5人则空了16个人的位置。问学生有多少人？共租了多少条船？

数学题解答：两种情况下，船的数量是不变的。

两种情况下，空的位置相差：16-2=14人。

两种坐法，每条船上人数相差：5-3＝2人。

船的数量：14÷2＝7条

人数：5×7-16＝19人，或：3×7-2＝19人。

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