There are 158 pear trees in the orchard, and the number of apple trees is 18 less than twice the number of pear trees. How many pear trees and apple trees are there altogether?
果园里有梨树158棵，苹果树的棵数比梨树的2倍少18棵，梨树和苹果树共多少棵？
<gadget id="calculator">158 * 2</gadget>
<output>316</output>

<gadget id="calculator">316 - 18</gadget>
<output>298</output>

<gadget id="calculator">298 + 158</gadget>
<output>456</output>

<result>456</result>