Answer:
x = 12
Explanation:
you need to isolate x. to do that, use inverse operations (if the equation includes addition, subtract, if it's multiplication, divide, etc)
40 = x/0.3 multiply by 0.3 on both sides
40 (0.3) = x/0.3 (0.3) the 0.3 will cancel each other out
x = 40 x 0.3 multiply
x = 12