How many consecutive 0.05s are subtracted from 4 to leave 1.
从4里面连续减去多少个0.05，才剩下1．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 / 0.05</gadget>
<output>60</output>

<result>60</result>