Come up with a question and reasoning that would justify this answer: 16
Question and rationale: The question is: Barbara wants to save up for a new wristwatch that costs $100. Her parents give her an allowance of $5 a week and she can either save it all up for the watch or spend it as she wishes. 10 weeks pass and due to spending some of her money on ice cream, Barbara currently only has $20. How many more weeks does she need to save for a watch if she stops spending on other things right now?
Step-by-step reasoning process: Since barbara needs $100, and she currently has $20, she is remaining with $100 - $20 = $80 to save. With an allowance of $5 each week, she'll need to save for 80 / 5 = 16 weeks.

Come up with a question and reasoning that would justify this answer: 16
Question and rationale: The question is: A group of 30 tourists sets out on a walking tour of the rainforest. Two tourists are eaten by anacondas, then half the remaining tourists try to pet poisonous dart frogs and get poisoned. If only 1/7 of the poisoned tourists recovered, how many tourists are left at the end of the tour?
Step-by-step reasoning process: First, subtract the two tourists the anacondas got from the initial 30 tourists: 30 - 2 = 28. Next, divide 28 by two to find out how many tourists got poisoned: 28 / 2 = 14. Now figure out how many of the 14 poisoned tourists recovered: 14 / 7 = 2. The total number of surviving tourists is 14 + 2 = 16.

Come up with a question and reasoning that would justify this answer: 156
Question and rationale: The question is: It's field trip month, and the students took six vans and four minibusses. There were 10 students on each van and 24 students on each minibus. How many students went on the field trip?
Step-by-step reasoning process: The total number of students who took the van is 6 x 10 = 60. The total number of students who took the minibus is 4 x 24 = 96. Therefore, 60 + 96 = 156 students went on the field trip.

Come up with a question and reasoning that would justify this answer: 30
Question and rationale:
The question is: A cleaning company produces two sanitizer sprays. One spray kills 50% of germs, and another spray kills 25% of germs. However, 5% of the germs they kill are the same ones. What percentage of germs would be left after using both sanitizer sprays together?
Step-by-step reasoning process: After the first spray kills 50% of germs, there will be 100 - 50 = 50% left. The second spray kills 25%, but 5% have already been killed by the 50% spray, so it kills 25 - 5 = 20%. After the second spray kills 20% of the remaining germs, there will be 50 - 20 = 30% left.