It is written on the blackboard that l, 2, 3, 4, ..., n (n < 100) erase one of the numbers, and the average of the remaining numbers is 47 (17/31), so what is the erased number?
黑板上写着l，2，3，4，…，n(n＜100)擦去其中某一个数后，余下数的平均数为47(17/31)，则擦去的这个数为多少．
<gadget id="calculator">47 * 93</gadget>
<output>4_371</output>

<gadget id="calculator">17 * 3</gadget>
<output>51</output>

<gadget id="calculator">4_371 + 51</gadget>
<output>4_422</output>

<gadget id="calculator">4_465 - 4_422</gadget>
<output>43</output>

<result>43</result>