This spring, 4 middle grade classes and 6 upper grade classes in Yucai Primary School planted a total of 1018 trees. On average, 52 trees are planted per class in the middle grades, and how many trees are planted in each class in the senior grades?
今年春天，育才小学中年级4个班和高年级6个班共植树1018棵．中年级平均每班种52棵，高年级平均每班种树多少棵？
<gadget id="calculator">52 * 4</gadget>
<output>208</output>

<gadget id="calculator">1_018 - 208</gadget>
<output>810</output>

<gadget id="calculator">810 / 6</gadget>
<output>135</output>

<result>135</result>