[Question]Emma buys 2 containers of milk every school day for lunch. She does not go to school on the weekends. How many containers of milk does she buy in 3 weeks?
[Answer]There are 5 school days in a week: 5 days / week x 2 containers of milk / day = 10 containers of milk every week. Finally the number of container for 3 weeks is 3 weeks x 10 containers / week = 30 containers. The answer is 30.

[Question]Louise is baking cakes for a gathering. She needs 60 cakes in total, and has already produced half this many. Today, she calculates how many cakes she has left to make and bakes half this amount. The next day, she again calculates how many cakes she has left to make and bakes a third of this amount. How many more cakes does Louise need to bake?
[Answer]Louise has already produced 60 cakes / 2 = 30 cakes. After calculating how many cakes are left, she bakes another 30 cakes / 2 = 15 cakes. The next day, she calculates again then bakes another 15 cakes / 3 = 5 cakes. She therefore still needs to bake 60 30 15 5 = 10 cakes. The answer is 10.

[Question]An earthquake caused four buildings to collapse. Experts predicted that each following earthquake would have double the number of collapsing buildings as the previous one, since each one would make the foundations less stable. After three more earthquakes, how many buildings had collapsed including those from the first earthquake?
[Answer]The second earthquake caused 2 * 4 = 8 buildings to collapse. The third earthquake caused 2 * 8 = 16 buildings to collapse. The fourth earthquake caused 16 * 2 = 32 buildings to collapse. Including the first earthquake, the earthquakes caused 4 + 8 + 16 + 32 = 60 buildings to collapse. The answer is 60.

[Question]Mabel is counting sharks in the ocean. She knows that of the fish that she sees, 25% will be sharks and 75% will be another type of fish. On day one she counts 15 fish. On day 2 she counts three times as many. How many sharks did she count over those two days?
[Answer]
She counts 45 fish on day 2 because 3 x 15 = 45. She counts 60 fish in total because 15 + 45 = 60. She counts 15 sharks because 60 x .25 = 15. The answer is 15.