C :

#include <stdio.h>
int a, t, i;
int main(void) {
    for (i = 1; i <= 20; i++) {
        scanf("%d", &a);
        t += a;
    }    
    printf("%d\n%.1f\n", t, t / 20.0);
    return 0;
}

C++ :

#include<iostream>

#include<cstdio>

using namespace std;

int main()
{
	double a,s;
	s=0;
	for (int i=1;i<=20;i++)
	{
		cin>>a;
		s=s+a;
	}
	cout<<s<<endl;
	printf("%.1lf",s/20);
	return 0;
}

Python :

# coding=utf-8
s = input(). split()
t = 0
for i in range(0, 20) :
    t = t + int(s[i])
print(t, format(t / 20, ".1f"), sep = '\n')