A piece of land is plowed by three tractors. A has plowed (2/5) of this land, B has plowed more (1/4) than C, and B has 100 hectares less than A. How many hectares does B plow?
一块地由三台拖拉机耕完，甲耕了这块地的(2/5)，乙耕的比丙耕的多(1/4)，乙比甲少耕100公顷，乙耕地多少公顷？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

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

<result>500</result>