Amanda received $50 as a gift. She plans to buy two cassette tapes that cost $9 each and a headphone set that costs $25. How much money will she have left? Give the rationale and then the answer.
Let's think step by step. Amanda spent 2 tapes * $9 / tape + $25 = $43. Amanda has $50 - $43 = $7 left.. The answer is: 7.

A zoo is arranging the layout of its animal enclosures. There are 4 tiger enclosures in a row and behind each of these are 2 zebra enclosures. There are three times as many giraffe enclosures as zebra enclosures scattered around the zoo. The tiger enclosures hold 4 tigers, the zebra enclosures hold 10 zebras and the giraffe enclosures hold 2 giraffes. If these are the only animals in the zoo, how many animals are in the zoo? Give the rationale and then the answer.
Let's think step by step. There are twice as many zebra enclosures, so there must be 4 tiger enclosures * 2 = 8 zebra enclosures. This means there are 8 zebra enclosures * 3 = 24 giraffe enclosures. In the tiger enclosures, there are 4 tiger enclosures * 4 = 16 tigers. In the zebra enclosures, there are 8 zebra enclosures * 10 zebras = 80 zebras. In the giraffe enclosures, there are 24 giraffe enclosures * 2 giraffes = 48 giraffes. So in total, there are 16 tigers + 80 zebras + 48 giraffes = 144 animals in the zoo.. The answer is: 144.

In a town, there is a multi-story parking lot, which has room for 425 cars. The parking lot has 5 levels, each of the same size. How many more cars can one level fit if there are already 23 parked cars on that level? Give the rationale and then the answer.
Let's think step by step. When all levels are empty, each level can fit 425 / 5 = 85 cars. When there are already 23 parked cars on a level, there is still a place for 85 - 23 = 62 cars.. The answer is: 62.