In a flower bed in Fenghuang community, the area of rose flowers accounts for (2/5), the area of rhododendrons accounts for (1/4), and the remaining 21 square meters are planted with crabapple flowers. What is the area of this flower bed in square meters?
凤凰小区的一个花坛里，月季花的面积占(2/5)，杜鹃花的面积占(1/4)，剩下的21平方米都种了海棠花．这个花坛的面积是多少平方米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (2/5) - (1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">21 / (7/20)</gadget>
<output>60</output>

<result>60</result>