Lisa, Jessie, and Devin scored 311 - 188 = 123 points. 123 / 3 = 41. Jessie scored 41 points.
The answer: 41
Reverse engineering the question: The Lady Eagles basketball team scored a total of 311 points in 5 games. Some players combined for 188 points. Lisa, Jessie, and Devin equally scored the rest. How many points did Jessie score?

In the third grade, there are 19 students. In the fourth grade, there are 2 × 19 = 38 students. Counting the boys and girls in the second grade, there are 10 + 19 = 29. There are 19 + 38 + 29 = 86 students in total.
The answer: 86
Reverse engineering the question: There are 19 students in the 3rd grade and twice that number in the 4th grade. There are 10 boys and 19 girls in the 2nd grade. How many students are there in total?

In the three quarters we have figures for, the store made a total of $1500 + $3000 + $2000 = $6,500. Subtracting this from their annual profit shows that they made $8000 – $6500 = $1,500 profit in the second quarter.
The answer: 1500
Reverse engineering the question: A store is comparing their profits throughout the year. They had profits of $1,500 in the first quarter of the year, $3,000 in the third quarter, and $2,000 in the fourth quarter. If their annual profits are $8,000, how much profit, in dollars, did they make in the second quarter?

Let's say Jason invested x amount of money. Since Jason started investing, he has earned the same amount he invested twice over in 5 months, meaning he has earned x + 2 * x = $90. This evaluates to 3x = $90. The total amount of money that Jason invested is x = $90 / 3. Jason invested x = $30. The total amount of money that Jason has earned from his investments is $90 - $30 = $60. If he earned an equal amount of money from the investment in five months, his monthly returns is 60 / 5 = $12.
The answer: 12
Reverse engineering the question:

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.
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Since Jason started investing, he has earned the same amount he invested twice over in 5 months. If Jason's investment currently is worth $90, how much has he been earning per month from his investment assuming he has been earning an equal amount of returns each month?