The third grade planted 38 trees, and the fourth grade planted twice as many trees as the third grade. How many trees were planted in the fourth grade?
三年级植树38棵，四年级植树的棵数是三年级的2倍，四年级植树多少棵？
<gadget id="calculator">38 * 2</gadget>
<output>76</output>

<result>76</result>