The students participated in tree planting activities. The third grade planted 30 trees, 5 less than the fourth grade, and the fifth grade planted twice as many trees as the third and fourth grades. How many trees are planted in the fifth grade?
同学们参加植树活动，三年级栽树30棵，比四年级少栽5棵，五年级栽树的棵数是三、四年级总数的2倍．五年级栽数多少棵？
<gadget id="calculator">30 + 30 + 5</gadget>
<output>65</output>

<gadget id="calculator">65 * 2</gadget>
<output>130</output>

<result>130</result>