#include <bits/stdc++.h> using namespace std; #define ll long long const int MOD=360; int main() { int t; cin>>t; while(t--){ ll l,r; cin>>l>>r; if(r-l<50){ ll cnt=0; for(ll i=0;i<=r-l;i++){ cnt+=(l+i)%9==0? 9 : (l+i)%9; } cout<<cnt<<endl; } else{ ll cnt=0; ll tot=r-l+1; while(l%9!=1){ cnt+=l%9==0? 9 : l%9; l++; tot--; } while(r%9!=0){ cnt+=r%9==0? 9 : r%9; r--; tot--; } cout<<cnt+(tot*5)<<endl; } } }