Step-by-step reasoning process: 15% of 3000 cars is (15 / 100) * 3000 = 450 cars. 40% of 3000 cars is (40 / 100) * 3000 = 1200 cars. 450 + 1200 = 1650 cars which cost either less than $15000 or more than $20000. Out of 3000 cars, there will then be 3000 - 1650 = 1350 cars left which cost between $15000 and $20000.
[Q & A] The question is At a certain car dealership, 15% of the cars cost less than $15000 and 40% of the cars cost more than $20000. If there are 3000 cars at the dealership, how many of them cost between $15000 and $20000?
The answer is 1350

Step-by-step reasoning process: Dad gave Olaf 10 toy cars,. Mom has given Olaf 5 more toy cars than Dad, so 10 + 5 = 15 toy cars. Auntie gave Olaf 6 toy cars,. Uncle has given 1 less toy than Auntie, so 6 - 1 = 5 toy cars. Grandpa gave Olaf 2 * 5 = 10 toy cars. All the family together gave Olaf 10 + 15 + 6 + 5 + 10 = 46. Adding the cars Olaf already had, Olaf's collection has 150 + 46 = 196 cars.
[Q & A] The question is Olaf collects colorful toy cars. At first, his collection consisted of 150 cars. His family, knowing his hobby, decided to give him some toy cars. Grandpa gave Olaf twice as many toy cars as the uncle. Dad gave Olaf 10 toy cars, 5 less than Mum. Auntie gave Olaf 6 toy cars, 1 more than the uncle. How many toy cars does Olaf have in total, after receiving all these gifts?
The answer is 196

Step-by-step reasoning process: After three treatments, the dog had 14 * 2 = 28 fleas. After two treatments, the dog had 28 * 2 = 56 fleas. After one treatment, the dog had 56 * 2 = 112 fleas. Before any treatments, the dog had 112 * 2 = 224 fleas. Thus, the dog had 224 - 14 = 210 more fleas before the treatments than after.
[Q & A] The question is A dog is being treated for fleas. One flea treatment gets rid of half the fleas. After four treatments, the dog has 14 fleas left. How many more fleas did the dog have before the flea treatments than after?
The answer is 210

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.
[Q & A]
The question is 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?
The answer is 35