There are 120 teachers in Guangming Primary School, and the number of male teachers is 1/2 that of female teachers. How many male teachers are there?
光明小学共有教师120人，男教师人数是女教师的(1/2)，男教师有多少人．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">120 / (3/2)</gadget>
<output>80</output>

<gadget id="calculator">80 * (1/2)</gadget>
<output>40</output>

<result>40</result>