A batch of vegetables is shipped from the store. Cucumbers account for 1/3 of the total, tomatoes account for 2/5 of the total, and potatoes account for the rest. What percentage of the batch of vegetables do potatoes account for?
商店运来一批蔬菜，黄瓜占总数的(1/3)，西红柿占总数的(2/5)，其它的是土豆，土豆占这批蔬菜的几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>