Of the 24 students in class, one-third are in the after-school chess program, and half of those students will be absent from school on Friday for the regional chess tournament. How many of the students in this class are going to that tournament?
Let's think: There are 24 / 3 = 8 students in the program. And 8 / 2 = 4 go to the tournament.. The answer is: 4.

The parking lot in front of the school has 52 parking spaces. The parking lot in the back of the school has 38 spaces. If 39 cars have parked and 1/2 of the spaces of the back are filled, how many parking spaces are still available in the school?
Let's think: There are a total of 52 + 38 = 90 parking spaces in the school. Since half of the spaces are filled then, 38 x 1 / 2 = 19 cars have parked at the back. So, a total of 39 + 19 = 58 cars have parked in the school. Therefore, 90 - 58 = 32 parking spaces are still available.. The answer is: 32.

The total cost of staying at High Services Hotel is $40 per night per person. Jenny and two of her friends went to the hotel and stayed for three nights. What's the total amount of money they all paid together?
Let's think: If each of them stayed 3 nights, the total cost per person is $40 / night * 3 nights = $120. Since they were three, the combined cost is $120 + $120 + $120 = $360.. The answer is: 360.

The age of Gladys is equal to twice the sum of the ages of Billy and Lucas. Billy is 3 times younger than Gladys who is 30 years old now. How old will Lucas be three years from now?
Let's think:
Billy's age is 30 / 3 = 10 years old. The sum of the ages of Billy and Lucas is 30 / 2 = 15. So, Lucas is 15 - 10 = 5 years old now. Therefore, Lucas will be 5 + 3 = 8 years old three years from now.. The answer is: 8.