There are two road construction teams, A and B. Team A has 120 people, and Team B has 87 people. Now due to work needs, the number of people in team A is twice that of team B. How many people should be transferred from team B to team A?
甲乙两个修路队，甲队120人，乙队87人，现在因工作需要，要求甲队的人数是乙队的2倍，乙队应调多少人到甲队．
<gadget id="calculator">120 + 87</gadget>
<output>207</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">207 / 3</gadget>
<output>69</output>

<gadget id="calculator">87 - 69</gadget>
<output>18</output>

<result>18</result>