Given that the average of A and B is 38, the average of B and C is 40, the average of C and D is 36, and the average of A and D is 34, then the average of A, B, C, and D is How many.
已知A和B的平均数是38，B和C的平均数是40，C和D的平均数是36，A和D的平均数是34，那A、B、C、D的平均数是多少．
<gadget id="calculator">38 * 2</gadget>
<output>76</output>

<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<gadget id="calculator">34 * 2</gadget>
<output>68</output>

<gadget id="calculator">76 + 80 + 72 + 68</gadget>
<output>296</output>

<gadget id="calculator">296 / 2 / 4</gadget>
<output>37</output>

<result>37</result>