Haman’s father has an egg business supplying the local market. On a Wednesday morning, his father sends him to go and collect 10 trays of eggs for sale from their store. While loading the eggs into the car, he accidentally drops two trays. He calls his father telling him this, and is told to add 7 more trays for sale. How many eggs were sold that day? Let's think first. Chain of thought:
When Haman collected 10 trays and dropped 2 trays, he was left with 10 trays - 2 trays = 8 trays. When he added 7 more trays, the total number of trays became 8 trays + 7 trays = 15 trays. Since each tray contains 36 eggs, the total number of eggs to be sold is 36 eggs / tray * 15 trays = 540 eggs.
Therefore, the answer is 540.