A middle school holds a Spring Festival sports meeting. The number of male athletes accounts for 5/9 of the total number of athletes, and there are 18 more female athletes than male athletes (3/5). How many male athletes are there?
某中学举行春运会，男运动员人数占全体人数的(5/9)，女运动员比男运动员的(3/5)多18人，男运动员有多少人？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(5/9) * (3/5)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(4/9) - (1/3)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">18 / (1/9)</gadget>
<output>162</output>

<gadget id="calculator">162 * (5/9)</gadget>
<output>90</output>

<result>90</result>