Another approach
The three number are: 17, 18 and 19
Let the first number be ##n## then we have: ##n+(n+1)+(n+2)=54##
##=> 3n+3=54##
##=> 3n=54-3##
##=>n=51/3=17##
So we have :##17+18+19=54##
Another approach
The three number are: 17, 18 and 19
Let the first number be ##n## then we have: ##n+(n+1)+(n+2)=54##
##=> 3n+3=54##
##=> 3n=54-3##
##=>n=51/3=17##
So we have :##17+18+19=54##