Classes A, B, and C have a total of 161 students. Class A has 2 more students than Class B, and Class B has 6 more students than Class C. How many students are there in Class B?
甲、乙、丙三个班共有学生161人，甲比乙班多2人，乙班比丙班多6人，乙班有多少人．
<gadget id="calculator">161 - 2</gadget>
<output>159</output>

<gadget id="calculator">6 + 159</gadget>
<output>165</output>

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

<gadget id="calculator">165 / 3</gadget>
<output>55</output>

<result>55</result>