There are 80 kilograms of oil in the barrel, 60% of which are used up, how many kilograms are used?
桶里装有80千克油，用去了60%，用去了多少千克？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">80 * (3/5)</gadget>
<output>48</output>

<result>48</result>