x = 3 is the solution of the equation

1. x + 7 = 4

2. x + 10 = 7

3. x + 7 = 10

4. x + 3 = 7

The solution of the equation 3x − 2 = 10 is

1. x = 1

2. x = 2

3. x = 3

4. x = 4

If there are x chairs in a row, then the number of persons that can be seated in 8 rows are

1. 64

2. x + 8

3. 8x

4. none of these