Q: Mike decides to buy a new camera. He wants to buy a top-of-the-line camera but he decides to wait for the new model to come out. The new model costs 30% more than the current model. The old camera cost $4000. He gets $200 off a $400 lens he bought. How much did he pay for the camera and lens?
A: The new camera cost 4000 * .3 = $1200 more than the old camera. So the camera cost 4000 + 1200 = $5200. The lens cost 400 - 200 = $200. So the total cost was 5200 + 200 = $5400. The answer is 5400.
Question: Eva learns for two semesters in a year. In 2019, she scored ten more marks in maths in the first semester than the second, 15 marks less in arts, and 1/3 marks less in science in the first semester than the second. If she got 80 marks in maths in the second semester, 90 marks in arts, and 90 in science, what's the total number of her marks in all the semesters?
Answer: In the first semester, she scored 80 + 10 = 90 marks in maths. She also scores 90 - 15 = 75 marks in arts in the first semester. She scored 1 / 3 marks less in science in the first semester than the second, which is 1 / 3 * 90 = 30. Her score in science in the first semester is 90 - 30 = 60. The total for the first semester is 90 + 75 + 60 = 225. The total for the second semester is 90 + 90 + 80 = 260. The combined marks for all the semesters in 260 + 225 = 485. The answer is 485.
[Question]Tom can type 90 words a minute. A page is 450 words. How long would it take him to type out 10 pages?
[Answer]He can type out 1 page in 450 / 90 = 5 minutes. So it would take 5 * 10 = 50 minutes. The answer is 50.
Q: Jimmy wants to play in the inflatable swimming pool in his backyard. The swimming pool is empty and the garage is locked, so he cannot use the hose to fill the pool. He finds a 2 gallon bucket and calculates that it takes 20 seconds to fill the bucket from the tap and carry it to the pool where he pours in the water. If the pool holds 84 gallons of water, how many minutes will it take Jimmy to fill the pool?
A: It will take 84 / 2 = 42 trips to fill the pool with water. This will take Jimmy 42 trips * 20 seconds per trip = 840 seconds. This means that Jimmy will spend 840 seconds * 1 minute / 60 seconds = 14 minutes filling the pool. The answer is 14.
Question: Three planes are going to the same place but each has a different number of passengers. The first plane has 50, the second had 60, and the third has 40. An empty plane can go 600 MPH, but each passenger makes it go 2 MPH slower. What is their average speed?
Answer: The first plane goes 100 MPH slower than empty because 50 x 2 = 100. The first plane goes 500 MPH because 600 - 100 = 500. The second plane goes 120 MPH slower because 60 x 2 = 120. The second plane goes 480 because 600 - 120 = 480. The third plane goes 80 MPH slower because 40 x 2 = 80. The third plane goes 520 MPH because 600 - 80 = 520. The total speed is 1500 because 500 + 480 + 520 = 1500. Their average speed is 500 because 1500 / 3 = 500. The answer is 500.
Q: At a convention, 16 of 36 delegates arrived with pre-printed name badges. Half of the remaining delegates made their own, hand-written name badges. How many delegates were not wearing name badges?
A:

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
There were 36 - 16 = 20 without pre - printed name badges. Then 20 / 2 = 10 made hand - written badges. There were 20 - 10 = 10 with no name badge. The answer is 10.