1. The problem statement, all variables and given/known data _+_+_= 30 (Fill the gaps using 1,3,5,7,9,11,13,15) 2. Relevant equations 3. The attempt at a solution I tried to go with x+y+z= 30 Then tried substituting values This is not an official question. Just something my friend asked me and I was curious. Please don't take any offense. Thank you very much for helping.