Nala found 5 seashells at the beach. The next day, she found another 7, and the following day, she found twice the number she got from the first two days. How many seashells does Nala have? Give the rationale and then the answer.
Let's think step by step. On the first and second days, Nala found 5 + 7 = 12 seashells. On the third day, she found 12 x 2 = 24 seashells. Altogether, she found 12 + 24 = 36 seashells.. The answer is: 36.

A movie that's 1.5 hours long is being replayed 6 times in one movie theater each day. There is a 20-minute advertisement before the start of the movie. How long, in hours, does the movie theater operate each day? Give the rationale and then the answer.
Let's think step by step. The movie that is being replayed 6 times takes 1.5 x 6 = 9 hours. The advertisements before the start of the movie take 20 x 6 = 120 minutes in all. One hundred twenty minutes is equal to 120 / 60 = 2 hours. Thus, the movie theater operates for 9 + 2 = 11 hours each day.. The answer is: 11.

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? Give the rationale and then the answer.
Let's think step by step. 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.