A tank of oil (1/4) is 16 kilograms, how many kilograms is 40% of it?
一箱油的(1/4)是16千克，它的40%是多少千克．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">16 / (1/4)</gadget>
<output>64</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">64 * (2/5)</gadget>
<output>128/5 = around 25.6</output>

<result>128/5 = around 25.6</result>