20 kilograms of apples, sell his (1/10) and then sell (1/10) kilograms, how many kilograms are sold in total?
20千克苹果，卖出他的(1/10)后又卖出(1/10)千克，共卖出多少千克．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">20 * (1/10)</gadget>
<output>2</output>

<gadget id="calculator">2 + (1/10)</gadget>
<output>21/10 = around 2.1</output>

<result>21/10 = around 2.1</result>