In the 2nd Foreign Language Culture Festival of Wuhan Experimental Foreign Language School, (3/4) students in the seventh grade participated in the English poster design competition, (4/5) students participated in the English dubbing competition, and students who participated in both competitions There are 325 people, (1/10) none of the students participated, so how many people in the seventh grade participated in the English dubbing competition?
在武汉实验外国语学校第二届外语文化节中，七年级有(3/4)的同学参加了英文海报设计大赛，(4/5)的同学参加了英语配音大赛，两种大赛都参加的同学有325人，(1/10)同学都没有参加，则七年级参加英语配音大赛的人数是多少人．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) - 1</gadget>
<output>-9/10 = around -0.9</output>

<gadget id="calculator">(3/4) + (4/5) + (-9/10)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">325 / (13/20)</gadget>
<output>500</output>

<gadget id="calculator">500 * (4/5)</gadget>
<output>400</output>

<result>400</result>