After subtracting how many 5s in a row from 150, there are 5 left.
从150里面连续减去多少个5后，还剩下5．
<gadget id="calculator">150 - 5</gadget>
<output>145</output>

<gadget id="calculator">145 / 5</gadget>
<output>29</output>

<result>29</result>