There are 75 people in the big class and the middle class of Guangming Kindergarten, among which the number of the big class accounts for (3/5), how many people are there in the middle class?
光明幼儿园大班和中班一共有75人，其中大班的人数占(3/5)，中班有多少人？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">75 * (3/5)</gadget>
<output>45</output>

<gadget id="calculator">75 - 45</gadget>
<output>30</output>

<result>30</result>