The farm tool factory plans to produce 1378 small farm tools. It has been produced for 10 days, and 91 pieces are produced every day. The rest will be completed in 4 days. How many pieces should be produced on average per day?
农具厂计划生产1378件小农具，已经生产了10天，每天生产91件，剩下的要4天完成，平均每天应做多少件？
<gadget id="calculator">91 * 10</gadget>
<output>910</output>

<gadget id="calculator">1_378 - 910</gadget>
<output>468</output>

<gadget id="calculator">468 / 4</gadget>
<output>117</output>

<result>117</result>