can u explain to me

sure. first, i draw a rough model to show how the difference between the prices of the cars. The question has already stated the total price of all 3 cars and the price of car C. So in order to find the price of both car A and car B u just need to minus the total price of all 3 cars with the price of car C. For the second part (the model drawing), the question has already given the difference between the prices of car A and car B. And from the answer from the first part (the total price of car A and car B), we already know the price of both car A and B, so we can also add this into our model.