In the talent show area, there are 45 people from class 3 of the third year, and girls account for 5/9 of the participants. How many boys are there?
才艺表演区，三年3班有45人参加，其中女生占了参加人数的(5/9)，男生有多少人参加？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (5/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">45 * (4/9)</gadget>
<output>20</output>

<result>20</result>