[Question]: A particular train has some passenger cars and a number of cargo cars equal to half the number of passenger cars plus three. If the total number of cars is 71, counting the engine and caboose, how many passenger cars are in the train?
[Answer]: First find the number of cars not counting the engine and caboose: 71 cars - 2 cars = 69 cars. Let p be the number of passenger cars and c be the number of cargo cars. We know that p + c = 69 and c = p / 2 + 3. Substituting the second equation into the first, we get p + p / 2 + 3 = 69. Combining like terms, we get 1.5p + 3 = 69. Subtracting 3 from both sides, we get 1.5p = 66. Dividing both sides by 1.5, we get p = 44.
So the answer is 44.

[Question]: Mark has 12 candy bars in total between Mars bars, Snickers, and Butterfingers. He has 3 Snickers and 2 Mars bars. How many Butterfingers does he have?
[Answer]: Not counting Butterfingers Mark has 3 + 2 = 5 candy bars. So Mark has 12 - 5 = 7 Butterfingers.
So the answer is 7.

[Question]: A farmer harvested 250 potatoes. He bundled them in twenty-five's and sold each bundle for $1.90. He also harvested 320 carrots and bundled them in twenty's and sold each bundle for $2. If the farmer sold all his harvested crops, how much did he get in all?
[Answer]:
There are 250 / 25 = 10 bundles of potatoes. So, 20 bundles of potatoes amount to $1.9 x 10 = $19. There are 320 / 20 = 16 bundles of carrots. So, 16 bundles of carrots amount to $2 x 16 = $32. Hence, the farmer got $19 + $32 = $51 in all.
So the answer is 51.