Rammy has saved some money for a new bicycle helmet that costs $47, but needs to savemore. He writes an addition equation with a variable to represent the amount of money thahe still needs to save.Which must be true about Rammy's equation?A. The amount he has saved and the cost of the helmet are on the same side ofthe equation.B. The amount he has saved and the variable are on the same side of the equation.C. The cost of the helmet and the variable are on the same side of the equation.D. He cannot write an addition equation to represent the problem.