barrel of oil, pour out (1/5) for the first time, pour out the first (4/7) for the second time, and there are 48 kilograms left in the barrel. How many kilograms is this barrel of oil originally?
一桶油，第一次倒出(1/5)，第二次倒出第一次的(4/7)，桶里还剩下48千克．这桶油原来有多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(1/5) * (4/7)</gadget>
<output>4/35 = around 0.114286</output>

<gadget id="calculator">1 - (1/5) - (4/35)</gadget>
<output>24/35 = around 0.685714</output>

<gadget id="calculator">48 / (24/35)</gadget>
<output>70</output>

<result>70</result>