The area of corn seed production in a certain village accounts for 80% of the total cultivated land area of the whole village, the area of tomato seed production accounts for 15% of the total cultivated area of the whole village, and the area of corn seed production is 390 mu more than the area of tomato seed production. How many acres of arable land does the whole village have?
某村玉米制种的面积占全村耕地总面积的80%，番茄制种的面积占全村耕地总面积的15%，玉米制种的面积比番茄制种的面积多390亩．全村共有耕地多少亩？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(4/5) - (3/20)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">390 / (13/20)</gadget>
<output>600</output>

<result>600</result>