Question 896194
100a+10b+c=x,
100c+10b+a=y,
x-y=594,
a=3c,
a+b+c=19

973 becomes 379
973-379=594

BTW 
There are only three possibilities for a=3c but two of the sums don't work
1+3+15 doesn't work
2+6+11 doesn't work
3+9+7=19 works