Two bags of sugar, one bag is 84 grains, and the other is 20 grains. Each time, take 8 sugars from the more bag and put them in the smaller bag. Take several times to make the number of sugars in the two bags the same many.
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，拿几次才能使两袋糖的粒数同样多．
<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>