For $\dfrac{x}{2} + \dfrac{x}{3} = 15$; the value of x is:

1. 18

2. 90

3. 15

4. 45

The sum of three odd numbers is 87. The largest of these is:

1. 27

2. 31

3. 29

4. 25

When four consecutive integers are added, their sum is -46. The smallest integer is:

1. 13

2. -13

3. 10

4. -10

The perimeter of a rectangular plot is 560 m and the length of the plot is three times its width; the length of the plot is:

1. 140 m

2. 210 m

3. 280 m

4. $186\dfrac{2}{3}m$