First find the number of minutes in 2 hours: 2 hours * 60 minutes / hour = 120 minutes. Then add 10 minutes to that amount to find the total number of minutes Walter spent at the zoo: 120 minutes + 10 minutes = 130 minutes. Let s be the amount of time he spends looking at the seals and p be the amount of time he spends looking at the penguins. From the problem, we know that s + p + 13 = 130 and p = 8s. Substituting the second equation into the first, we get s + 8s + 13 = 130. Combining like terms, we get 9s + 13 = 130. Subtracting 8 from both sides, we get 9s = 117. Dividing both sides by 9, we get s = 13.
The answer: 13
Reverse engineering the question: Walter goes to the zoo, where he spends a certain amount of time looking at the seals, eight times as long looking at the penguins, and 13 minutes looking at the elephants. If he spent 2 hours and 10 minutes at the zoo, how many minutes did he spent looking at the seals?

There were 6 x 8 = 48 bananas from the bunches with 8 bananas in a bunch. There were 5 x 7 = 35 bananas from the bunches with 7 bananas in a bunch. Therefore, Nathan had 48 + 35 = 83 bananas.
The answer: 83
Reverse engineering the question: Nathan bought one large box of bananas. He saw that there are six bunches with eight bananas in a bunch and five bunches with seven bananas in a bunch. How many bananas did Nathan have?

The number of comic books that females like is 30 / 100 * 300 = 90 books. Together, both males and females like 90 + 120 = 210 comic books. The number of comic books that are disliked by both males and females is 300 - 210 = 90. The percentage of books that are disliked by both genders is 90 / 300 * 100 = 30%.
The answer: 30
Reverse engineering the question: Out of the 300 comic books in a comic store, 30% are liked by females, males like 120, and both genders don't like the rest. What percentage of the comic books are disliked by both males and females?

After giving a box to his mom, Seth had 4 * 2 = 8 boxes left. Seth bought 8 + 1 = 9 boxes of oranges.
The answer: 9
Reverse engineering the question:
Seth bought some boxes of oranges. He gave a box to his mother. He then gave away half of the remaining boxes. If Seth has 4 boxes of oranges left, how many boxes did he buy in the first place?