Q: Betty is planning to host her friends over for a party. She buys drinks, cakes, and ice creams at a unit cost of $2, $10, and $5 respectively. How much does she spend if she buys 10 drinks, 5 cakes, and 100 ice creams?
A: The amount she spends on buying drinks is $2 * 10 = $20. The amount she spends on buying cakes is $10 * 5 = $50. The amount she spends on buying ice creams is $5 * 100 = $500. The total amount she spends is $20 + $50 + $500 = $570. The answer is 570.

Q: Marcus, Humphrey, and Darrel are bird watching. Marcus sees 7 birds, Humphrey sees 11 birds, and Darrel sees 9 birds. How many birds does each of them see on average?
A: They see 27 total birds because 9 + 11 + 7 = 27. They see an average of 9 birds each because 27 / 3 = 9. The answer is 9.

Q: Tim's car goes down in value by $1000 a year. He bought it for $20,000. How much is it worth after 6 years?
A:
It went down in value 1000 * 6 = $6000. So the car is worth 20000 - 6000 = $14,000. The answer is 14000.