The farm tool factory plans to produce 1378 small farm tools, and it has been produced for 10 days. How many, the rest will be completed in 4 days, and how many pieces should be made per day on average? (First add a suitable condition on the horizontal line, and then answer it)
农具厂计划生产1378件小农具，已经生产了10天，多少，剩下的要4天完成，剩下的平均每天应做多少件？(先在横线上补充一个合适的条件，再解答出来)
<result>91</result>