On the clock face, when the time is 12:30, what is the angle between the minute hand and the hour hand?
在钟面上，当时间是12时30分的时候，分针和时针所夹的角是多少度．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">30 * 5</gadget>
<output>150</output>

<gadget id="calculator">15 + 150</gadget>
<output>165</output>

<result>165</result>