There are two types of vegetables planted in a piece of land, among which (2/7) are tomatoes and (5/7) are pumpkins. What percentage of the total number of tomatoes is less than pumpkins?
一块地种了两种蔬菜，其中(2/7)种西红柿，(5/7)种南瓜，西红柿比南瓜少总数的几分之几？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(5/7) - (2/7)</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>