There is a garden in the Dongdi Middle School campus, in which the area of rose flowers accounts for (1/5), the area of peonies accounts for (1/7), and the rest is lawn. What percentage of the area is the lawn?
董地中学校园里有一个花园，其中月季花的面积占(1/5)，牡丹花的面积占(1/7)，其余是草坪．草坪的面积占几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/5) - (1/7)</gadget>
<output>23/35 = around 0.657143</output>

<result>23/35 = around 0.657143</result>