Q: Every year in January, Natalia, the librarian, tidies up the books. She has 145 novels, 271 comics, 419 documentaries, and 209 albums to store. She wants to put these in crates that can hold 9 items. How many crates will Natalia use?
A: Let’s first calculate the total number of items: 145 + 271 + 419 + 209 = 1044 items. Now let’s put the items in the crates: 1044 / 9 = 116 crates. The answer is 116.

Q: Peter has to walk 2.5 miles to get to the grocery store. If it takes him 20 minutes to walk one mile and he has walked 1 mile already, how many more minutes does he have to walk to reach it?
A: Peter has to walk a remaining 2.5 total miles - 1 mile completed = 1.5 miles remaining. It will take him another 20 minutes * 1.5 miles remaining = 30 minutes to get to the grocery store. The answer is 30.

Q: A laboratory has 22 beakers of liquid in a fume hood, and 8 of the beakers have copper ions in them. Adding three drops of a solution will turn the liquid in a beaker blue if there are copper ions present. If the beakers are tested one by one for copper ions and 45 drops are used before all 8 beakers with copper ions are found, how many beakers without copper ions were tested?
A:
There were 45 / 3 = 15 beakers tested to find all the beakers with copper ions. Thus, 15 - 8 = 7 beakers without copper ions were tested. The answer is 7.