Answer:
#include <iostream>
using namespace std;
int main() {
int sum = 0;
for(int n = 20; n<25; n+=2) {
sum += n;
}
cout << sum << endl;
}
Step-by-step explanation:
A shorter, less-readable i.m.o., way would be:
int main() {
int sum = 0;
for(int n = 20; n<25; sum+=n, n+=2);
cout << sum << endl;
}
But don't use tricks like that in production code.