There are 45 students swimming in the swimming pool, among them (5/9) are male students. How many male students are there?
游泳池里有45位同学在游泳，其中(5/9)是男同学．男同学有多少人？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">45 * (5/9)</gadget>
<output>25</output>

<result>25</result>