[Question]The ratio of cows to bulls in a barn is 10:27. If there are 555 cattle on the farm, how many bulls are on the farm?
[Answer]The total ratio of cattle on the farm is 10 + 27 = 37. Since the fraction that represents bulls from the total ratio is 27 / 37, the number of bulls on the farm is 27 / 37 * 555 = 405. The answer is 405.

[Question]Billy has 8 hours of free time on each day of the weekend. He wants to spend 75% of his time playing video games and the rest of his time reading. He can read 60 pages an hour and his books all contain 80 pages. How many books does he read?
[Answer]He has 16 hours because 2 x 8 = 16. He is going to spend 25% of his time reading because 100 - 75 = 25. He has 4 hours to read because 16 x .25 = 4. He will read 240 pages because 4 x 60 = 240. He will read 3 books because 240 / 80 = 3. The answer is 3.

[Question]Brendan went fishing with his dad. Brenden caught 8 fish in the morning. He threw 3 back that were too small. He caught 5 more in the afternoon. Brendan's dad caught 13 fish. How many fish did they catch in all?
[Answer]Brenden caught 8 fish in the morning + 5 in the afternoon = 13 fish. After throwing the small fish back, Brenden has 13 3 = 10 fish. Together, Brenden and his dad caught 10 + 13 = 23 fish. The answer is 23.

[Question]Oleg is an event organizer. He is organizing an event with 80 guests where 40 of them are men, half the number of men are women, and the rest are children. If he added 10 children to the guest list, how many children will there be at the event?
[Answer]
There are 40 / 2 = 20 women at the event. Hence, there are a total of 40 + 20 = 60 men and women at the event. So, the total number of children at the event is 80 - 60 = 20. After Oleg added 10 children to the guest list, there are a total of 20 + 10 = 30 children. The answer is 30.