How do I put letters in "interger" problems in C++

#include <iostream>

main(){
    using namespace std;
    cout << "Finish the math problem." << endl;
    int x;
    int y;
    x = 5;
    y = 5;
    cout << "The answer is" x + y << endl;
    cout << "The answer is" x * y << endl;
    cout << "The answer is" x / y << endl;
    cout << "The answer is" x - 4 << endl;
    cout << "The answer is" x - 2 << endl;
    cout << "The answer is" x / 10 << endl;
}