数学题：加工一批服装，每天加工300套，16天可以完成。

（1）如果每天加工400套，提前几天完成？

（2）如果每天多加工20套，几天可以完成？

（3）如果要提前5天完成，每天要加工多少套？

数学题解答：

①16-300×16÷400 = 4(天)

②300×16÷（300+20）＝15（天）

③300×16÷（16-5）= 436（套）……4（套）

436+1=437（套）

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