The school needs to spend a sum of money to buy a batch of desks and chairs. If you buy a set of 500 yuan, you will have 800 yuan left. If you buy a set of 600 yuan, you will have two sets less than what you plan to buy. How much money does the school have to buy desks and chairs?

The number of desks and chairs planned to buy is: (1200 + 800) / (600-500), = 2000 / 100, = 20 (sets); the money planned to buy desks and chairs is: 20 × 500 + 800, = 10000 + 800, = 10800 (yuan); or: 600 × (20-2), = 600 × 18, = 10800 (yuan); a: the money for school to buy desks and chairs is 10800 yuan

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