There is a group of monkeys, divide a bunch of peaches, the first monkey divided 4 peaches and 1/10 of the remaining peaches, the second monkey divided 8 peaches and 1/10 of the remaining peaches at this time, the third monkey The monkey divided 12 peaches and 1/10 of the remaining peaches...and so on. Finally, it was found that the pile of peaches had just been divided, and each monkey got the same amount of peaches. So how many monkeys are there in this group?
有一群猴子，分一堆桃子，第一只猴子分了4个桃子和剩下桃子的1/10，第二只猴子分了8个桃子和这时剩下桃子的1/10，第三只猴子分了12个桃子和这时剩下桃子的1/10…依此类推．最后发现这堆桃子正好分完，且每只猴子分得的桃子同样多．那么这群猴子有多少只？
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">40 - 8</gadget>
<output>32</output>

<gadget id="calculator">32 * 10</gadget>
<output>320</output>

<gadget id="calculator">320 + 4</gadget>
<output>324</output>

<gadget id="calculator">32 + 4</gadget>
<output>36</output>

<gadget id="calculator">324 / 36</gadget>
<output>9</output>

<result>9</result>