simple programming question

#include <iostream>

using namespace std;

int main()
{
        int a;
        int b;
        int c;
        int d;
        int e;
        int f;
        int g;
        int aa;
        int bb;
        int cc;
        int dd;
        int ee;
        int ff;
        int gg;
        int sum;

        cout << "Welcome to the Basic Mathematics Quiz!" << endl;
        cout << "This quiz will test you on your Addition, Subtraction, Multiplication, and Division skills." << endl;
        cout << endl;
        cout << "Let's begin!" << endl;
        cout << endl;
        cout << "What is 2 + 2?" << endl;
            cin >> a;
                if(a==4){
                    cout << "Correct. Next problem..." << endl;
                    aa = 1;
                }
                if (a!=4){
                    cout << "Incorrect. Next problem..." << endl;
                    aa = 0;
                }
                cout << endl;
        cout << "What is 10 - 5?" << endl;
            cin >> b;
                if (b==5){
                    cout << "Correct. Next problem..." << endl;
                    bb = 1;
                }
                if (b!=5){
                    cout << "Incorrect. Next problem..." << endl;
                    bb = 0;
                }
                cout << endl;
        cout << "What is 15 * 2?" << endl;
            cin >> c;
                if (c==30){
                    cout << "Correct. Next problem..." << endl;
                    cc = 1;
                }
                if (c!=30){
                    cout << "Incorrect. Next problem..." << endl;
                    cc = 0;
                }
                cout << endl;
        cout << "What is 50 / 25?" << endl;
            cin >> d;
                if (d==2){
                    cout << "Correct. Next problem..." << endl;
                    dd = 1;
                }
                if (d!=2){
                    cout << "Incorrect. Next problem..." << endl;
                    dd = 0;
                }
                cout << endl;
        cout << "Using the order of operations, what is 5 + 10 * 5 - 10?" << endl;
            cin >> e;
                if (e==45){
                    cout << "Correct. Next problem..." << endl;
                    ee = 1;
                }
                if (e!=45){
                    cout << "Incorrect. Next problem..." << endl;
                    ee = 0;
                }
                cout << endl;
        cout << "Using the order of operations, what is 2 / 10 * 5 + 15?" << endl;
            cin >> f;
                if (f==40){
                    cout << "Correct. Next problem..." << endl;
                    ff = 1;
                }
                if (f!=40){
                    cout << "Incorrect. Next problem..." << endl;
                    ff = 0;
                }
                cout << endl;
        cout << "Using the order of operations, what is 10 * 10 + 100 / 2 - 50?" << endl;
            cin >> g;
                if (g==100){
                    cout << "Correct. Next problem..." << endl;
                    gg = 1;
                }
                if (g!=100){
                    cout << "Incorrect. Next problem..." << endl;
                    gg = 0;
                }
                cout << endl;

        cout << "Test Complete!" << endl;
                if (aa + bb + cc + dd + ee + ff + gg == 7){
                    cout << "You made a 7/7! " << 100/7*7 << "% Score!" << endl;
                }
                if (aa + bb + cc + dd + ee + ff + gg == 6){
                    cout << "You made a 6/7! " << 100/7*6 << "% Score!" << endl;
                }
                if (aa + bb + cc + dd + ee + ff + gg == 5){
                    cout << "You made a 5/7! " << 100/7*5 << "$ Score!" << endl;
                }
                if (aa + bb + cc + dd + ee + ff + gg == 4){
                    cout << "You made a 4/7! " << 100/7*4 << "% Score!" << endl;
                }
                if (aa + bb + cc + dd + ee + ff + gg == 3){
                    cout << "You made a 3/7! " << 100/7*3 << "% Score!" << endl;
                }
                if (aa + bb + cc + dd + ee + ff + gg == 2){
                    cout << "You made a 2/7! " << 100/7*2 << "% Score!" << endl;
                }
                if (aa + bb + cc + dd + ee + ff + gg == 1){
                    cout << "You made a 1/7! " << 100/7*1 << "% Score!" << endl;
                }
                if (aa + bb + cc + dd + ee + ff + gg == 0){
                    cout << "You made a 0/7! " << 100/7*0 << "% Score!" << endl;
                }

    return 0;
}