[Question]: Alison bought some storage tubs for her garage. She bought 3 large ones and 6 small ones, for $48 total. If the large tubs cost $6, how much do the small ones cost?
[Answer]: Let t be the price of the small tubs. 3 * 6 + 6 * t = 48. 18 + 6 * t = 48. 6 * t = 48 - 18 = 30. 6t = 30. t = 5 dollars for each small tub.
So the answer is 5.

[Question]: Brian is a real estate agent. He makes a 2% commission on each sale. During June, he sold three houses. The houses sold for $157,000, $499,000, and $125,000. What was Brian’s total commission on these three sales?
[Answer]: Brian sold houses for 157,000 + 499,000 + 125,000 = $781,000 in total. Brian's commission was 781,000 * 0.02 = $15,620.
So the answer is 15620.

[Question]: Patrick has 4 hours less than twice the amount of time that Greg has left to finish his homework. Greg has six hours less than Jacob left to finish his homework. If Jacob has 18 hours left to finish his homework, calculate the total number of hours they all have left to finish their homework?
[Answer]:

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.
user
If Jacob has 18 hours left to finish his homework, Greg has 18 - 6 = 12 hours left to finish his homework. The total number of hours Jacob and Greg have left to finish their homework is 12 + 18 = 30 hours. Patrick has 4 hours less than twice Greg has left to finish his homework, meaning Patrick has 4 hours less than 12 * 2 = 24 hours left to finish his homework. Patrick has 24 - 4 = 20 hours left to finish his homework. Altogether, the three have 30 + 20 = 50 hours left to finish their homework.
So the answer is 50.