If a carton containing a dozen mirrors is dropped, then which of the following cannot be the ratio of broken mirrors to unbroken mirrors?

1. 2 : 1

2. 7 : 5

3. 3 : 2

4. 3 : 1

A mixture of paint is prepared by mixing 2 parts of red pigments with 5 parts of the base. Using the given information in the following table, find the values of a, b and c to get the required mixture of paint.

1. a = 10, b = 10, c = 10

2. a = 5, b = 2, c = 5

3. a = 10, b = 5, c = 10

4. a = 10, b = 5, c = 15

0.5 of a number is equal to 0.07 of another. The ratio of the numbers is :

1. 1 : 14

2. 5 : 7

3. 7 : 50

4. 50 : 7