A car needs gasoline (1/10) liter to travel 1 kilometer, and its mailbox contains 40 liters of gasoline, which is used up (3/4) after driving for a period of time. How many kilometers can I travel on the remaining oil?
一辆汽车行1千米需要汽油(1/10)升，它的邮箱装了40升汽油，行驶了一段时间后用了(3/4)．剩下的油能行驶多少千米？
<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>10</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">10 / (1/10)</gadget>
<output>100</output>

<result>100</result>