Dongdong's family bought a bag of 30 kilograms of flour and ate (2/3), how many kilograms did he eat.
东东家买来一袋30千克的面粉，吃了(2/3)，吃了多少千克．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">30 * (2/3)</gadget>
<output>20</output>

<result>20</result>