Françoise sells pots of lily of the valley to fund humanitarian work. She buys them at €12 each and sells them at a 25% higher cost. How much will she give back to the association by selling 150 pots of lily of the valley?
Let's think: The benefit of selling one pot is 12 * 25 / 100 = €3. So, Françoise will give 150 * €3 = €450 to the association.. The answer is: 450.

Thomas owns 200 books. He decides to sell them and use the money to buy records. Each book sells for $1.5. A record costs $3. If he buys 75 records, how much money does he have left over?
Let's think: He makes $300 selling the books because 200 x 1.5 = 300. He spends $225 on records because 75 x 3 = 225. He has $75 left because 300 - 225 = 75.. The answer is: 75.

Larry spent $5 for lunch and gave his brother $2. How much did Larry have at the beginning if he has $15 now?
Let's think: Larry spent a total of $5 + $2 = $7. He has $15 + $7 = $22 at the beginning.. The answer is: 22.

Stuart is going on a cross-country trip and wants to find the fastest route. On one route the total distance is 1500 miles and the average speed is 75 MPH. On the second trip, the total distance is 750 but the average speed is 25 MPH. How long does his trip take if he goes on the fastest route?
Let's think:
The first route will take 20 hours because 1,500 / 75 = 20. The second route will take 30 hours because 750 / 25 = 30. The fastest route takes 20 hours because 20 < 30.. The answer is: 20.