Aunt Li's family has an orchard with apple, pear and peach trees. Apple trees and pear trees account for (2/3) of the entire orchard, pear trees and peach trees account for (3/5) of the entire orchard, how many pear trees are planted in the entire orchard.
李阿姨家有一个果园，里面种了苹果树、梨树和桃树．苹果树和梨树占了整个果园的(2/3)，梨树和桃树占了整个果园的(3/5)，种的梨树占了整个果园的多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(3/5) - 1</gadget>
<output>-2/5 = around -0.4</output>

<gadget id="calculator">(2/3) + (-2/5)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>