b) To find x, we can solve the equation:

3.5% * x = 150

To solve for x, we can divide both sides of the equation by 3.5%:

x = 150 / 3.5%

c) To find x, we can solve the equation:

3 : 1.5 = 15

To solve for x, we can multiply both sides of the equation by 1.5:

x = 15 * 1.5

d) To find x, we can solve the equation:

125% * x = 18

To solve for x, we can divide both sides of the equation by 125%:

x = 18 / 125%

e) To find x, we can solve the equation:

1.8 - (x + 2) = 1.2

To solve for x, we can simplify the equation:

1.8 - x - 2 = 1.2

Combine like terms:

-0.2 - x = 1.2

To solve for x, we can subtract 0.2 from both sides of the equation:

- x = 1.2 - 0.2

Simplify:

- x = 1

To solve for x, we can multiply both sides of the equation by -1:

x = -1