[Question]: 4 students participated in a 200m race. If the average completion time of the last three students was 35 seconds, and the average completion time of all four runners was 30 seconds, how long (in seconds) did it take the student who came first to finish the race?
[Answer]: The last 3 students had an average completion time of 35 seconds so the sum of their completion times was 3 * 35 = 105 seconds. All 4 students (now including the student who came first) had an average completion time of 30 seconds, meaning the sum of their completion times is 4 * 30 = 120 seconds. The student who came first spent 120 - 105 = 15 seconds in the race.
So the answer is 15.

[Question]: Elijah drank 8.5 pints of coffee yesterday. Emilio drank 9.5 pints of water yesterday. How many cups of liquid did the two boys drink yesterday?
[Answer]: Total drunk: 8.5 + 9.5 = 18 pints. 18 pints * 2 = 36 cups. The two boys drank a total of 36 cups of liquid yesterday.
So the answer is 36.

[Question]: During the soccer match, The Kickers scored 2 goals in the first period and twice that amount in the second period. The other team, The Spiders, scored half the amount that The Kickers scored in the first period and twice the amount that The Kickers scored in their second period. What is the total amount of goals both teams scored?
[Answer]:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The Kickers scored twice as many as 2 goals in the second period, so 2 * 2 = 4 goals. The Spiders scored half as many as The Kickers' 2 goals from the 1st period so .5 * 2 = 1 goal in the first period. The Spiders scored twice as many as The Kickers' 4 goals from the second period, so 2 * 4 = 8 goals in the second period. Together, they scored 2 + 4 + 1 + 8 = 15 goals total.
So the answer is 15.