A barrel of oil, 150 kilograms, how many kilograms are left after using three-fifths of it?
一桶油，150千克，用去它的五分之三剩下多少千克？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">150 * (2/5)</gadget>
<output>60</output>

<result>60</result>