An ornamental vegetable pocket pumpkin, 42 yuan per pot, buy 6 pots and get one free. Aunt Wang wants to buy 7 pots at a time, how much is each pot cheaper?
一种观赏蔬菜袖珍南瓜，每盆42元，买6盆送一盆．王阿姨一次想买7盆，每盆便宜多少元？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">42 * (6/7)</gadget>
<output>36</output>

<gadget id="calculator">42 - 36</gadget>
<output>6</output>

<result>6</result>