In a tree planting activity, 120 trees were planted in the fourth grade, 130 trees were planted in the fifth grade, and the number of trees planted in the sixth grade was 3/5 of the total number of trees in the fourth and fifth grades. How many trees were planted in the sixth grade?
在一次植树活动中，四年级植树120棵，五年级植树130棵，六年级植树的棵树是四、五年级总棵数的(3/5)，六年级植树多少棵？
<gadget id="calculator">120 + 130</gadget>
<output>250</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">250 * (3/5)</gadget>
<output>150</output>

<result>150</result>