Answer:
#include<iostream> 
 using namespace std; 
 int main() 
{ 
 double data[3][5],avg,least,most,total; 
 int leastNum,mostNum; 
 for(int i=0;i<3;i++) 
 { 
 cout<<"Enter quantity of food for monkey "<<i+1<<":\\"; 
 for(int j=0;j<5;j++) 
 { 
 cout<<"Day "<<j+1<<": "; 
 cin>>data[i][j]; 
 } 
 } 
 least = data[0][0]; 
 most = data[0][0]; 
 for(int i = 0;i<3;i++) 
 { 
 for(int j = 0;j<5;j++) 
 { 
 total+=data[i][j]; 
 if(data[i][j]>most) 
 { 
 most=data[i][j]; 
 mostNum=i+1; 
 } 
 if(data[i][j]<least) 
 { 
 least=data[i][j]; 
 leastNum=i+1; 
 
 } 
 } 
 } 
 avg=total/5.0; 
 cout<<"Average food eaten in a day by all the 3 monkeys: "<<avg<<endl; 
 cout<<"Most amount of food eaten in a day: "<<most<<" by monkey: "<<mostNum<<endl; 
 cout<<"Least amount of food eaten in a day: "<<least<<" by monkey: "<<leastNum<<endl; 
 return 0; 
}