I am not sure, but this made sense for me try it yourself, ok so Imani allowance is not known, what we know is that she had earned 4 dollars because she washed the car and at the end she ends with 12, that makes it where her allowance would be 16 you spend half of it you are left with 8, than you add the 4 so you get 8 plus 4 is 12 which is what she ended with.
