The students planted trees. The fifth grade planted 45 trees, and the sixth grade planted 22 more trees than the fifth grade. How many more trees are planted in sixth grade than in fifth grade?
同学们栽树，五年级载了45棵，六年级栽的棵数比五年级的2倍还多22棵．六年级比五年级多栽多少棵？
<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<gadget id="calculator">22 - 45</gadget>
<output>-23</output>

<gadget id="calculator">90 + (-23)</gadget>
<output>67</output>

<result>67</result>