On Children's Day, the school will have a performance. There are 2 red and yellow tops and 3 blue, blue and white trousers. Now Xiaoli randomly takes out a top and a pair of trousers to make a set. What is the possibility of having a yellow top?
儿童节，学校要表演节目．现有红、黄2件上衣和蓝、青、白3条裤子，现小丽任意拿出一件上衣和一条裤子配成一套，有黄上衣的可能性是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>