Use a tractor to plow the land. On the first day, 25% of the total land is plowed, and the rest (2/3) is plowed on the second day. It is known that the second day is 30 mu more than the first day. How many mu of land are there in total?
用拖拉机耕地，第一天耕了全部土地的25%，第二天耕了剩下的(2/3)，已知第二天比第一天多耕30亩，问共有多少亩地？
<gadget id="calculator">25 / 100</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">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/4) * (2/3)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">30 / (1/4)</gadget>
<output>120</output>

<result>120</result>