There are 45 students in Class 1, Grade 5 of the Attached Primary School, among which girls account for (5/9), and among the girls (4/5) students love to watch "Little Doudou by the Window". How many girls in Class 1 of Grade 5 like to watch it? "Little Peas by the Window"?
进修附小五年级一班有学生45人，其中女生占(5/9)，女生中又有(4/5)的学生爱看《窗边的小豆豆》，五年级一班有多少女生爱看《窗边的小豆豆》？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

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

<gadget id="calculator">45 * (5/9) * (4/5)</gadget>
<output>20</output>

<result>20</result>