Three tractors A, B, and C plow a piece of land together. A plows (2/5) of this piece of land. The ratio of the area of the arable land between B and C is 5:4. B plows 100 mu less than A. Ask B plowed How many acres?
甲、乙、丙三台拖拉机合耕一块地，甲耕了这块地的(2/5)，乙与丙耕地面积比为5：4，乙耕的比甲少100亩，问乙耕了多少亩？
<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">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</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">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1_500 * (3/5) * (5/9)</gadget>
<output>500</output>

<result>500</result>