On Arbor Day, the sixth graders came to the hillside to plant trees. The original plan was to plant 7 trees per person, and 25 people were needed. Actually, 5 trees were planted per person. How many more people should be added?
植树节，六年级同学来到山坡植树，原计划每人值7棵，需要25人，实际每人植5棵，还要增加多少人？
<gadget id="calculator">7 * 25</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>