There are three numbers A, B, and C, where A is 2 greater than B, and B is 11 greater than C. It is known that the average of these three numbers is 70, find the number C.
有A、B、C三个数，其中A比B大2，B比C大11，已知这三个数的平均数是70，求数C．
<gadget id="calculator">70 * 3</gadget>
<output>210</output>

<gadget id="calculator">210 - 11 - 13</gadget>
<output>186</output>

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

<gadget id="calculator">186 / 3</gadget>
<output>62</output>

<result>62</result>