#include<iostream>
using namespace std;
int main()
{
int mile=0;
int gallon=0;
int TM=0; //total mile
int TG=0; //total gallon
double MPG=0;
double Total=0;
while(mile!=0)
{
cin>>mile>>gallon;
MPG=mile/gallon;
TM=TM+mile;
TG=TG+gallon;
Total=TM/TG;
cout<<"MPG this trip:"<<MPG<<endl<<"Total MPG:"<<Total<<endl;
cout<<"Enter miles driven (-1 to quit):"<<mile<<endl<<"Enter gallons used:"<<gallon<<endl;
}
return 0;
}
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