The master and apprentice produced 894 parts in 6 days. The master produces 81 per day, how many per day does the apprentice produce?
师徒两人6天生产了894个零件．师傅每天生产81个，徒弟每天生产多少个？
<gadget id="calculator">894 / 6</gadget>
<output>149</output>

<gadget id="calculator">149 - 81</gadget>
<output>68</output>

<result>68</result>