pencil is 9 cm 3 mm long. After 5 days of use, there is 6 cm 8 mm left. How many millimeters are used on average per day?
一枝铅笔长9厘米3毫米，用了5天后，还剩6厘米8毫米．平均每天用去多少毫米？
<gadget id="calculator">93 - 68</gadget>
<output>25</output>

<gadget id="calculator">25 / 5</gadget>
<output>5</output>

<result>5</result>