The master processes 90 parts per hour, and the number of parts processed by the apprentice per hour is exactly half of the master's. How many parts do they process in total per hour?
师傅每小时加工90个零件，徒弟每小时加工的零件个数正好是师傅的一半．他们两每小时一共加工多少个零件？
<gadget id="calculator">90 / 2</gadget>
<output>45</output>

<gadget id="calculator">45 + 90</gadget>
<output>135</output>

<result>135</result>