Direction: Read the following information and answer the questions given below:

In a shopping mall, there are three laptop stores called X, Y, Z. They sell two types of laptop, i.e., Dell and HP. They sold a total of 3000 laptops. The number of HP laptops sold by store X is 40 more than the number of HP laptops sold by store Z. The average number of HP laptops sold by store X and store Y is 350. Store X alone sold 300 HP laptops. Store Y sold a total of 575 laptops. The ratio of the number of Dell laptops sold by store X and store Z is 2 : 3.