A pocket pumpkin, an ornamental vegetable, is 30 yuan per pot, buy 5 pots and get one free. Aunt Wang buys 5 pots at a time, how much is each pot cheaper?
一种观赏蔬菜袖珍南瓜30元/盆，买5盆送一盆．王阿姨一次买5盆，每盆便宜多少元？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<result>5</result>