[Question]: A developer was buying land. He bought 4 acres at $1,863 per acre. He then split the land he purchased into 9 lots. How much should he sell each lot for just to break even?
[Answer]: His purchase cost is 4 acres * $1863 = $7452. He divided the land into 9 plots, so the price per lot would be $7452 / 9 = $828.
So the answer is 828.

[Question]: Justin needs to read at least 100 pages or more of his book in one week to pass his class. He has read 10 pages already on the first day. Assuming he reads twice the amount of pages as the first day each day in the remaining 6 days, how many pages will he have read after the week is over?
[Answer]: 10 pages per day on day 1 * 2 = 20 pages per day for days 2 through 7. 20 * 6 remaining days = 120 pages total from days 2 through 7. 10 pages day 1 + 120 pages days 2 through 7 = 130 total pages read in one week.
So the answer is 130.

[Question]: Brittany, Alex, and Jamy all share 600 marbles divided between them in the ratio 3:5:7. If Brittany gives Alex half of her marbles, what's the total number of marbles that Alex has?
[Answer]:
The total ratio representing the number of marbles is 3 + 5 + 7 = 15. From the ratio, the fraction representing the number of marbles that Brittany has is 3 / 15, which is equal to 3 / 15 * 600 = 120 marbles. Alex has 5 / 15 * 600 = 200 marbles. If Brittany gives half of her marbles to Alex, Alex receives 1 / 2 * 120 = 60 marbles. After receiving 60 marbles from Brittany, Alex has 200 + 60 = 260 marbles.
So the answer is 260.