bag of flour weighs 120 kilograms. One third of it is used on the first day and 1/2 of it is used on the second day. How many kilograms of flour are left in the bag?
一袋面粉重120千克，第一天用去它的(1/3)，第二天用去它的(1/2)，这袋面粉还剩下多少千克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">120 * (1/6)</gadget>
<output>20</output>

<result>20</result>