The school held a singing competition, 120 people won the third prize, the number of people who won the second prize was the third prize (3/4), and the number of people who won the first prize was the second prize (1/2). How many people won the first prize?
学校举行歌咏比赛，获三等奖的有120人，获二等奖的人数是三等奖的(3/4)，获一等奖的是二等奖的(1/2)．获一等奖的有多少人？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">120 * (3/4) * (1/2)</gadget>
<output>45</output>

<result>45</result>