Hans booked a room in a hotel. The hotel has 10 floors with 10 identical rooms on each floor. Because of an accident, the last floor is unavailable for the guests. Considering there are no other guests, in how many different rooms could Hans be checked in? Give the rationale and then the answer.
Let's think step by step. The hotel has in total 10 floors * 10 rooms / floor = 100 rooms. One floor is unavailable, so Hans could be checked into 100 rooms - 10 rooms = 90 available rooms.. The answer is: 90.

There are 4 puppies and 3 dogs at a camp. Each dog eats twice as much food as a puppy, but each puppy eats three times as often as a dog. If a dog eats 4 pounds of food three times a day, what would be the total amount of food the dogs and puppies eat in a day? Give the rationale and then the answer.
Let's think step by step. Eating three times a day, a dog eats 3 * 4 = 12 pounds of food. Since there are 3 dogs at the camp, the total amount of food they eat is 3 * 12 = 36 pounds of food in a day. If each dog eats twice as much food as a puppy, a puppy will eat 4 / 2 = 2 pounds of food in one meal. Each puppy eats three times as often as a dog, and if a dog eats three times in a day, a puppy will eat 3 * 3 = 9 times in a day. Since a puppy eats 2 pounds of food a day, the total amount of food a puppy will eat in a day is 9 * 2 = 18 pounds of food. Four puppies in the camp eat 18 * 4 = 72 pounds of food every day. Together, the dogs and the puppies eat 72 + 36 = 108 pounds of food in a day.. The answer is: 108.

Tony paid $7 for 2 dozen apples and 1 bunch of bananas. Arnold paid $5 for 1 dozen apples and 1 bunch of bananas. How much does a bunch of bananas cost? Give the rationale and then the answer.
Let's think step by step. Tony paid $7 - $5 = $2 more than Arnold. We know he bought the same number of bananas as Arnold but that he bought 2 - 1 = 1 dozen apples more than Arnold. Therefore a dozen apples should cost $2. If Arnold paid $5 and $2 for a dozen apples then the bunch of bananas cost $5 - $2 = $3.. The answer is: 3.