Put 30 pieces of the same chocolate on the left side of the balance, and put 300 grams of weight on the right side, then the balance is tilted. If 5 pieces of chocolate are removed, the balance will be balanced, so how many grams does each piece of chocolate weigh?
在天平的左边放30粒同样的巧克力，右边放300克砝码，这时天平倾斜．如果拿掉5粒巧克力，天平就平衡，那么每粒巧克力重多少克．
<gadget id="calculator">30 - 5</gadget>
<output>25</output>

<gadget id="calculator">300 / 25</gadget>
<output>12</output>

<result>12</result>