There are three extracurricular activity groups in Yongfeng Primary School. The first and second groups have an average of 50 people, the second and third groups have an average of 43 people, and the first and third groups have an average of 45 people. Find the average number of people in each of the three groups.
永丰小学有三个课外活动小组，一、二两个小组平均50人，二、三两个小组平均43人，一、三两个小组平均45人，求三个小组平均每组的人数．
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">43 * 2</gadget>
<output>86</output>

<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<gadget id="calculator">100 + 86 + 90</gadget>
<output>276</output>

<gadget id="calculator">276 / 2 / 3</gadget>
<output>46</output>

<result>46</result>