There are 12 male teachers in Hope Primary School, 20 fewer than twice as many female teachers. How many teachers are there in Hope Primary School?
希望小学有男教师12人，比女教师的2倍少20人，希望小学共有多少名教师？
<gadget id="calculator">12 + 20</gadget>
<output>32</output>

<gadget id="calculator">32 / 2</gadget>
<output>16</output>

<gadget id="calculator">16 + 12</gadget>
<output>28</output>

<result>28</result>