In a rectangular garden leaf with a length of 60 meters and a width of 20 meters, the area of a string of reds occupies (1/4), and the rest of the area is planted with tulips. How many square meters is the planting area of tulips?
在一块长60米、宽20米的长方形花圃叶，一串红的面积占了(1/4)，其余的面积种郁金香．郁金香的种植面积是多少平方米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">60 * 20 * (3/4)</gadget>
<output>900</output>

<result>900</result>