Q: There are 10 students in a class. The average age of 9 of them is 8 years. By how many years will this average increase if the tenth student is (quite strangely) 28 years old?
A: 9 students have an average age of 8 years so the sum of their ages is 9 * 8 = 72 years. A tenth student who is 28 years old will make the sum 72 + 28 = 100 years. The new average age will be 100 / 10 = 10 years. This is 10 - 8 = 2 years higher than the previous average. The answer is 2.
Question: In a hotdog eating competition, the first competitor can eat 10 hot dogs per minute. The second competitor can eat 3 times more than the first competitor, while the third competitor can eat twice as much as the second competitor. How many hotdogs can the third competitor eat after 5 minutes?
Answer: The second competitor can eat 10 x 3 = 30 hotdogs per minute. The third competitor can eat 30 x 2 = 60 hot dogs per minute. Therefore, the third competitor can eat 60 x 5 = 300 hot dogs after 5 minutes. The answer is 300.
[Question]Sol sells candy bars to raise money for her softball team. On the first day, she sells ten candy bars and sells four more candy bars than she sold the previous day each day afterward. If she sells six days a week and each candy bar costs 10 cents, how much will she earn in a week in dollars?
[Answer]Sol will sell 10 + 4 = 14 candies on the second day. She will sell 14 + 4 = 18 candies on the third day. She will sell 18 + 4 = 22 candies on the fourth day. She will sell 22 + 4 = 26 candies on the fifth day. She will sell 26 + 4 = 30 candies on the sixth day. She will sell a total of 10 + 14 + 18 + 22 + 26 + 30 = 120 candies in a week. Hence, she will earn 120 x 10 = 1200 cents. Since 1 dollar is equal to 100 cents, then Sol will earn 1200 / 100 = $12. The answer is 12.
Q: James made $4000 in January. The next month he made twice as much. In March, however, James made $2000 less than in February. How much has James made so far this year?
A: In February James made 4000 * 2 = 8000. In March James made 8000 - 2000 = 6000. In total for the year James has made 4000 + 8000 + 6000 = $18000. The answer is 18000.
Question: Jaylen’s dog eats 1 cup of dog food in the morning and 1 cup of dog food in the evening. If she buys a bag that has 32 cups of dog food, how many days can she feed her dog with it?
Answer: Every day, Jaylen’s dog eats 1 x 2 = 2 cups of dog food. The bag will feed her dog for 32 / 2 = 16 days. The answer is 16.
Q: Kristine has 7 more CDs than Dawn. If Dawn has 10 CDs, how many CDs do they have together?
A:
Kristine has 10 + 7 = 17 CDs. Thus, they both have 10 + 17 = 27 CDs together. The answer is 27.