Three kinds of fruits are planted in the orchard, among which the number of orange trees accounts for (1/4) of the total, the number of apple trees accounts for (3/5) of the total, and the number of pear trees accounts for 45. How many trees are planted in the orchard? ?
果园里种了三种水果，其中橘树的棵数占总数的(1/4)，苹果树的棵数占总数的(3/5)，梨树有45棵，果园一共种了多少棵树？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">1 - (1/4) - (3/5)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">45 / (3/20)</gadget>
<output>300</output>

<result>300</result>