Question: Jodi and Vance are researching on a deserted island and have to stay on the island for a certain number of weeks to carry out their research. On their first expedition, they stayed for three weeks on the island. They spent two weeks more on the second expedition than they spent on their first expedition. They spent twice as many weeks on their last expedition as they spent on their second expedition. Calculate the total number of days they spent on the island on all the trips.
Answer: If they spent two more weeks on their second research expedition than they spent on the first week, they spent 2 + 3 = 5 weeks on the island. In the two expeditions, they stayed on the island for a total of 5 + 3 = 8 weeks. On their third expedition, they spent twice as many weeks as they spent on the second week on the island, which is 2 * 5 = 10 weeks. In all three expeditions, they stayed on the island for 10 + 8 = 18 weeks. Since a week has seven days, they spent 18 * 7 = 126 days on the island. The answer is 126.

Question: 85 paper stars are required to fill a glass jar. Luke has already made 33 stars, but he needs to fill 4 bottles. How many more stars must Luke make?
Answer: Luke must make 85 x 4 = 340 stars in total. He needs to make another 340 - 33 = 307 stars. The answer is 307.

Question: Shara borrowed money from her brother 6 months ago. She returned $10 per month to her brother. Currently, she was able to return half of the money she borrowed. How much will she still owe her brother 4 months from now?
Answer: For 6 months, Shara was able to return $10 x 6 = $60 to her brother. Since she already returned half of the money, then this means she currently owes her brother $60. Four months from now, she will be able to pay an additional $10 x 4 = $40. Thus, she will still owe her brother $60 - $40 = $20 four months from now. The answer is 20.

Question: Surfers enjoy going to the Rip Curl Myrtle Beach Surf Festival. There were 1500 surfers at the Festival on the first day, 600 more surfers on the second day than the first day, and 2/5 as many surfers on the third day as the first day. What is the average number of surfers at the Festival for the three days?
Answer:
If there were 1500 surfers on the first day, the total for the second day is 1500 surfers + 600 surfers = 2100 surfers. On the third day, the number of surfers was 2 / 5 * 1500 surfers = 600 surfers. The total number of surfers at the Festival in the three days was 1500 surfers + 2100 surfers + 600 surfers = 4200 surfers. The average number of surfers at the Beach Surf Festival for the three days is 4200 surfers / 3 days = 1400 surfers / day. The answer is 1400.