The sum of three natural numbers A, B, and C is 111. It is known that the average of A, B is 31, and the average of A, C is 37. What is the average of B and C?
三个自然数A、B、C之和是111，已知A、B的平均数是31，A、C的平均数是37．那么B、C的平均数多少
<gadget id="calculator">31 * 2</gadget>
<output>62</output>

<gadget id="calculator">111 - 62</gadget>
<output>49</output>

<gadget id="calculator">37 * 2</gadget>
<output>74</output>

<gadget id="calculator">111 - 74</gadget>
<output>37</output>

<gadget id="calculator">49 + 37</gadget>
<output>86</output>

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

<result>43</result>