Use (2/5) of a piece of land to plant cabbage, and the rest to plant radishes and tomatoes at a ratio of 3:4. It is known that (8/15) hectares of tomatoes are planted. How many hectares of cabbage are planted?
用一块地的(2/5)种白菜，其余的按3：4的比分别种萝卜和西红柿，已知西红柿种了(8/15)公顷，白菜种了多少公顷？
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</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">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(3/5) * (4/7)</gadget>
<output>12/35 = around 0.342857</output>

<gadget id="calculator">(8/15) / (12/35)</gadget>
<output>14/9 = around 1.555556</output>

<gadget id="calculator">(14/9) * (2/5)</gadget>
<output>28/45 = around 0.622222</output>

<result>28/45 = around 0.622222</result>