A bucket of water weighs 42 kg. After pouring out a part, there is still 30% left, and the barrel weighs 14 kilograms at this time. How many kilograms of water was in the bucket?
一桶水连桶重42千克．倒出一部分后还剩下30%，这时连桶重14千克．桶里原来有水多少千克？
<gadget id="calculator">42 - 14</gadget>
<output>28</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">28 / (7/10)</gadget>
<output>40</output>

<result>40</result>