has 216 glass balls, and B has 54 of the same glass balls. The two give balls to each other. After 8 times, A has 8 times as many balls as B. On average, how many balls does A give B less each time.
甲有216个玻璃球，乙有54个同样的玻璃球．两人相互给球，8次后，甲有的个数是乙的8倍，平均每次甲要少给乙多少个球．
<gadget id="calculator">216 + 54</gadget>
<output>270</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">270 / 9</gadget>
<output>30</output>

<gadget id="calculator">54 - 30</gadget>
<output>24</output>

<gadget id="calculator">24 / 8</gadget>
<output>3</output>

<result>3</result>