In June the hobby store sold 21,122 + 3,922 = 25,044 trading cards. Over June and July the store sold 25,044 + 21,122 = 46,166 trading cards.
The answer: 46166
Reverse engineering the question: The hobby store normally sells 21,122 trading cards per month. In June, the hobby store sold 3,922 more trading cards than normal. If the hobby store sold the regular number of trading cards in July, how many trading cards did the hobby store sell in June and July combined?

The cost of the geography books is 35 * 10.5 = $367.5. The cost of the English books is 35 * 7.5 = $262.5. The total amount of the order is 367.5 + 262.5 = $630.
The answer: 630
Reverse engineering the question: Ali's class wants to order 35 English textbooks and 35 geography textbooks. Knowing that a geography book costs $10.50 and that an English book costs $7.50, what is the amount of this order?

The number of girls was 2 / 5 times more than the boys, which is 2 / 5 * 50 = 20 more girls. The total number of girls on the trip is 50 + 20 = 70. Together with the driver, the assistant driver, and the teacher, there were 70 + 50 + 3 = 123 people on the bus.
The answer: 123
Reverse engineering the question: On a trip to visit the local museum, Mr. Gordon has taken 2/5 times more girls than boys. If their bus has a driver and an assistant, and the total number of boys on the trip is 50, calculate the total number of people on the bus considering the teacher also drives together with the students on the bus.

The injury would be fully healed after 3 * 5 = 15 days. So he would start exercising again in 15 + 3 = 18 days. He would then wait for 3 * 7 = 21 more days to start lifting heavy again. That means he needs to wait 18 + 21 = 39 days.
The answer: 39
Reverse engineering the question:
James hurt himself exercising. The pain subsided after 3 days, but he knew that the injury would take at least 5 times that long to fully heal. After that, he wanted to wait another 3 days before he started working out again. If he wants to wait 3 weeks after that to start lifting heavy again, how long until he can lift heavy again?