When Xiaojun was doing an addition test, he mistook the 2 in the ones place of one addend as 3, and the 7 in the tens place of the other addition as 1, and the sum he got was 901. What was the original correct sum? ．
小军在做一道加法试题时，把一个加数个位上的2错看成3，把另一个加数十位上的7错看成1，所得的和是901，原来正确的和是多少．
<gadget id="calculator">901 - 13</gadget>
<output>888</output>

<gadget id="calculator">888 + 72</gadget>
<output>960</output>

<result>960</result>