A snail wanted to go to the mouth of the well at the bottom of a well 60 meters deep. It climbs 5 meters during the day and slides down 3 meters at night. Think about it, do the math, how many days does it take for the snail to climb to the mouth of the well?
一只蜗牛在60米深的井底想到井口去．它白天爬上5米，夜晚又滑下3米．想一想，算一算，蜗牛爬到井口要用多少天？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">30 - 1</gadget>
<output>29</output>

<result>29</result>