The farm has a total of 100 hectares of land, of which (3/10) is planned to be planted with peanuts, and the rest are planted with soybeans and corn at an area ratio of 4:3. How many hectares of corn are planted?
农场共有100公顷土地，计划用其中的(3/10)种花生，其余的按4：3的面积比种植大豆和玉米．种植玉米多少公顷？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">100 * (7/10) * (3/7)</gadget>
<output>30</output>

<result>30</result>