The average weight of A, B, and C is 60 kg, the average weight of A and B is 55 kg, and the average weight of B and C is 65 kg. What is the weight of B in kg?
甲、乙、丙三人的平均体重为60千克，甲、乙的平均体重为55千克，乙、丙的平均体重为65千克，乙的体重是多少千克．
<gadget id="calculator">65 * 2</gadget>
<output>130</output>

<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<gadget id="calculator">55 * 2</gadget>
<output>110</output>

<gadget id="calculator">180 - 110</gadget>
<output>70</output>

<gadget id="calculator">130 - 70</gadget>
<output>60</output>

<result>60</result>