There were 25 children who distributed oranges, and each of them got 7 oranges on average. Some children came, and everyone redistributed these oranges, and each person got 5 oranges on average. How many children are there again?
有25个儿童分橘子，平均每人分到7个橘子，又来了一些儿童，大家重新分这些橘子，平均每人只分到5个．又来了几个儿童？
<gadget id="calculator">25 * 7</gadget>
<output>175</output>

<gadget id="calculator">175 / 5</gadget>
<output>35</output>

<gadget id="calculator">35 - 25</gadget>
<output>10</output>

<result>10</result>