After subtracting how many 15s in a row from 635, there are 5 left.
从635里连续减去多少个15后，还剩下5．
<gadget id="calculator">635 - 5</gadget>
<output>630</output>

<gadget id="calculator">630 / 15</gadget>
<output>42</output>

<result>42</result>