Given the task definition and input, reply with output. In this task, you are given a context tweet and an answer. Your job is to generate a question for the given answer based on the given tweet paragraph. Note that your question should be answerable based on the given tweet, and the answer to your question should be the given answer.

Context: 100s of #refugees stuck inside a train, nowhere to go. Hot, humid, tension rising. Unbearable conditions w/@arwaCNN cstreib (@cstreib) September 3, 2015 Answer: 100s
how many refugees were stuck?