Uncle Zhang's family contracted a piece of land to plant fruit trees. The area planted with pear trees is 9 hectares less (1/4) than the area planted with peach trees, and the area planted with apple trees is (5/4) that of peach trees. How many hectares to plant apple trees?
张大伯家承包了一片地种果树．种梨树9公顷，比种的桃树的面积少(1/4)，种苹果树的面积是桃树的(5/4)．种苹果树多少公顷？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">9 / (3/4)</gadget>
<output>12</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">12 * (5/4)</gadget>
<output>15</output>

<result>15</result>