The fuel tank on a car is filled with gasoline. After 40 liters of gasoline are used up, there is still (3/4) left. How many liters is the volume of the fuel tank?
一辆汽车上的油箱里装满汽油，用去40升汽油后，还剩下(3/4)，这个油箱的容积是多少升？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 / (1/4)</gadget>
<output>160</output>

<result>160</result>