Huashan Primary School planted 56 trees in the third grade, 112 in the fourth grade, and 10 fewer trees in the fifth grade than twice the total number of the third and fourth grades. How many trees are planted in fifth grade?
华山小学三年级栽树56棵，四年级栽112棵，五年级栽的比三、四年级总数的2倍少10棵．五年级栽树多少棵？
<gadget id="calculator">56 + 112</gadget>
<output>168</output>

<gadget id="calculator">168 * 2</gadget>
<output>336</output>

<gadget id="calculator">336 - 10</gadget>
<output>326</output>

<result>326</result>