There are 390 apple trees and pear trees in Wang Gang’s orchard, and the ratio of apple trees to pear trees is 8:5. How many more apple trees does Wang Gang have than pear trees?
王刚家的果园里的苹果树和梨树共390棵，苹果树和梨树的棵数比是8：5．王刚家的苹果树比梨树多多少棵？
<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">8 / 13</gadget>
<output>8/13 = around 0.615385</output>

<gadget id="calculator">5 / 13</gadget>
<output>5/13 = around 0.384615</output>

<gadget id="calculator">(8/13) - (5/13)</gadget>
<output>3/13 = around 0.230769</output>

<gadget id="calculator">390 * (3/13)</gadget>
<output>90</output>

<result>90</result>