barrel of oil weighs 60 kilograms, pour out its (1/3) for the first time, and pour out its (2/7) for the second time, how many kilograms are left?
一桶油重60千克，第一次倒出它的(1/3)，第二次倒出它的(2/7)，还剩多少千克？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (1/3) - (2/7)</gadget>
<output>8/21 = around 0.380952</output>

<gadget id="calculator">60 * (8/21)</gadget>
<output>160/7 = around 22.857143</output>

<result>160/7 = around 22.857143</result>