30% of a tank of water is used for the first time, and 5 liters are used for the second time compared to the first time. There are 35 liters of water left in the tank. How many liters of water are there in this tank?
一箱水，第一次用去了30%，第二次比第一次多用5升，水箱里还剩35升水，这箱水有多少升．
<gadget id="calculator">5 + 35</gadget>
<output>40</output>

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

<gadget id="calculator">(3/10) * 2</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">40 / (2/5)</gadget>
<output>100</output>

<result>100</result>