Master Yang made 36 parts in 4 hours, and Master Zhang made 3 more parts per hour than Master Yang. How many parts did Master Zhang make per hour?
杨师傅4小时做了36个零件，张师傅每小时比杨师傅多做3个零件，张师傅每小时做多少个零件？
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">9 + 3</gadget>
<output>12</output>

<result>12</result>