The school has a garden, in which the area of rose flowers accounts for (1/3), the area of rhododendrons accounts for (1/5), and the rest is lawn. What percentage of the area is the lawn?
学校有一个花园，其中月季花的面积占(1/3)，杜鹃花的面积占(1/5)，其余是草坪．草坪的面积占几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/3) - (1/5)</gadget>
<output>7/15 = around 0.466667</output>

<result>7/15 = around 0.466667</result>