Three tractors A, B, and C plow a piece of land. A has plowed the land (2/5), B has plowed more (1/4) than C, and B has 100 mu less than A. Ask B. How many acres? (column solution)
甲，乙，丙三台拖拉机耕一块地，甲耕了这块地的(2/5)，乙耕的比丙多(1/4)，乙耕的比甲少100亩，问乙耕了多少亩？(列式解答)
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 + (1/4) + 1</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">(5/4) / (9/4)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(3/5) * (5/9)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">100 / (1/15)</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 * (2/5)</gadget>
<output>600</output>

<gadget id="calculator">600 - 100</gadget>
<output>500</output>

<result>500</result>