Q: There are 50 apples and 40 oranges in the cafeteria. If an apple costs $0.80 and an orange costs $0.50, how much does the cafeteria earn for apples and oranges if there are only 10 apples and 6 oranges left?
A: Counting the remaining 10 apples. There were 50 - 10 = 40 apples sold. Counting the remaining 6 oranges. There were 40 - 6 = 34 oranges sold. The amount of sales for the apples is $0.8 x 40 = $32. The amount of sales for the oranges is $0.5 x 34 = $17. The cafeteria's total earnings are $32 + $17 = $49. The answer is 49.

Q: Two boxes for carrying oranges with a capacity of 80 and 50 were filled with 3/4 and 3/5 of the way full with oranges, respectively. Calculate the total number of oranges the boxes have together.
A: For the box with a capacity of 80, if it was 3 / 4 full with oranges, it had 3 / 4 * 80 = 60 oranges. The second box, with a capacity of 50, was 3 / 5 full with oranges, which totals 3 / 5 * 50 = 30 oranges. Together, the two boxes have 60 + 30 = 90 oranges. The answer is 90.

Q: Trevor is currently 11 years old and his older brother is 20 years old. How old will Trevor be when his older brother is three times as old as Trevor is now?
A:
When Trevor is 11, his older brother will be 11 x 3 = 33 years old. Trevor’s older brother is 20 - 11 = 9 years older than Trevor. Since Trevor is 9 years younger, Trevor will be 33 - 9 = 24 years old. The answer is 24.