For a barrel of soybean oil, pour out (1/5) of this barrel of oil for the first time, and pour out (3/10) of this barrel of oil for the second time, and there is still 35 kg left. How much does this barrel of soybean oil weigh?
一桶豆油，第一次倒出这桶油的(1/5)，第二次倒出这桶油的(3/10)，还剩35千克，这桶豆油重多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (1/5) - (3/10)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">35 / (1/2)</gadget>
<output>70</output>

<result>70</result>