Students go on a spring outing, among them (1/9) fly kites, (4/9) go rowing, and the rest go mountain climbing. What percentage of them are the people climbing mountains?
同学们去春游，其中(1/9)的人放风筝、(4/9)的人去划船，其余的人去爬山、爬山的人数是其中的几分之几？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

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

<result>4/9 = around 0.444444</result>