Answer the following question.
In a 90-minute soccer game, Mark played 20 minutes, then rested after. He then played for another 35 minutes. How long was he on the sideline?
Step-by-step reasoning process: Mark played for a total of 20 + 35 = 55 minutes. So, he was on the sideline for 90 - 55 = 35 minutes.
The answer is 35.

Answer the following question.
Archibald and his brother are playing tennis against each other. Archibald has won 12 games and his brother has won 18. What percentage of games has Archibald won?
Step-by-step reasoning process: They have played 30 total games because 12 + 18 = 30. The proportion won by Archibald is .4 because 12 / 30 = .4. The percentage he has won in 40% because .4 x 100% = 40%.
The answer is 40.

Answer the following question.
The number of short students in a class is 2/5 of the total number of students. If there are 90 tall students, and the class has 400 students, calculate the total number of students with average height.
Step-by-step reasoning process: The number of short students in the class is 2 / 5 * 400 = 160. The total number of short and tall students is 160 + 90 = 250. Since there are 400 students in the class, the number of students with average height is 400 - 250 = 150.
The answer is 150.

Answer the following question.
Maiya has two sisters. The first sister is twice as old as Maiya. The first sister is 1 year younger than Maiya. Their average age is 5. How old is Maiya?
Step-by-step reasoning process: Their total age is 15 because 3 x 5 = 15. 15 - X - 2X - (X - 1) is equivalent to 16 = 4X. Maiya is 4 years old because 16 / 4 = 4.
The answer is 4.