There is a batch of fruits, if you put 30 in each box, you will get 20 more; if you put 35 in each box, you will get 10 less. How many fruits are there in this batch?
有一批水果，每箱放30个则多20个；每箱放35个则少10个．这批水果至少有多少个．
<gadget id="calculator">210 - 10</gadget>
<output>200</output>

<result>200</result>