There are 30 cars in the parking lot, and the number of buses is less than that of cars (1/6). How many buses are there?
停车场有30辆小汽车，大客车的辆数比小汽车少(1/6)，大客车有多少辆？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">30 * (5/6)</gadget>
<output>25</output>

<result>25</result>