#include <bits/stdc++.h> using namespace std; int main() { double ave_price; ave_price=(5+8+12)*1.0/3; cout<<fixed<<setprecision(3)<<ave_price<<'\n'; cout<<39/5<<" "<<39%5<<endl; cout<<39/8<<" "<<39%8<<endl; cout<<39/12<<" "<<39%12<<endl; return 0; }