15 balls are taken out (1/3), how many balls are taken out.
15只皮球取出(1/3)，取出多少只只．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">15 * (1/3)</gadget>
<output>5</output>

<result>5</result>