The number N is written “htu”  and has value 100h+10t+u



The digit reversal info leads to  h=t+2

You are also directly given info that tells you

  u  = t+3

  h+t+u = 11



By substituting, this leads to:

(t+2)+t+(t+3) =11

3t + 5 = 11

t = 2  ==> u = 5,  h = 4



The number is 425

 

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