Two bags of sugar, one with 84 grains and one with 20 grains, take out 8 sugars from the more bag and put them into the less bag each time, in order to make the two bags of sugar have the same number of grains how many times
两袋糖，一袋是84粒，一袋是20粒，每次从多的一袋里拿出8粒糖放到少的一袋里去，为使两袋糖的粒数同样多，需要拿多少次
<gadget id="calculator">84 - 20</gadget>
<output>64</output>

<gadget id="calculator">8 + 8</gadget>
<output>16</output>

<gadget id="calculator">64 / 16</gadget>
<output>4</output>

<result>4</result>