Two numbers are in the ratio 5 : 8. If 10 is subtracted from each number, the ratio becomes 4 : 7. The numbers are :

1. 80 and 40

2. 50 and 80

3. 25 and 40

4. 40 and 25

The compounded ratio of x - y : x + y and (x + y)² : x² - y² is :

1. 2 : 1

2. 1 : (x + y)²

3. 1 : 1

4. 1 : 2