Xiao Pang is a little careless. When calculating an addition problem, he mistakenly wrote an addend 36 as 63, and the result was 278. Do you know what the other addend was?
小胖是个小粗心，在计算一道加法题时，错把一个加数36写成了63，结果得278，你知道原先另一个加数是几吗？
<gadget id="calculator">278 - 63</gadget>
<output>215</output>

<result>215</result>