Step-by-step reasoning process: For every addition of 100 people added the speed is halved so for the first 100 people added its speed is 1 / 2 * 500 km / hr = 250 km / hr. For another addition of 100 people its speed is also halved, 1 / 2 * 250 km / hr = 125 km / hr. So for the total of 200 additional people, its speed is 125 km / hr.
The question and answer:
Question and answer: For every 100 additional people that board a spaceship, its speed is halved. If the speed of the spaceship with 200 people on board is 500km per hour, what is its speed in km/hr when there are 400 people on board?
The answer is 125

Step-by-step reasoning process: For buying 4 jackets Martha gets 4 jackets / 2 = 2 jackets for free. For buying 9 t - shirts, Martha gets 9 t - shirts / 3 = 3 t - shirts for free. Adding the free jackets, Martha gets 4 jackets + 2 jackets = 6 jackets. Adding the free t - shirts, Martha gets 9 t - shirts + 3 t - shirts = 12 t - shirts. In total, Martha will take home 6 jackets + 12 t - shirts = 18 clothes.
The question and answer:
Question and answer: On Blacks, Martha goes to the mall to buy clothes on sale. For every 2 jackets she buys, she gets 1 free jacket. For every 3 t-shirts she buys, she gets 1 free t-shirt. Martha decides to buy 4 jackets and 9 t-shirts. How many clothes will she take home?
The answer is 18

Step-by-step reasoning process: In total, Bryan would have done 3 sets * 15 push - ups / set = 45 push - ups. Subtracting the push - ups he didn't do in the third set, Bryan did 45 push - ups - 5 push - ups = 40 push - ups.
The question and answer:
Question and answer:
Bryan starts exercising at home during quarantine. To start, he decides to do 3 sets of 15 push-ups each. Near the end of the third set, he gets tired and does 5 fewer push-ups. How many push-ups did he do in total?
The answer is 40