Give the step-by-step reasoning process and then the final answer. Edith is a receptionist at a local office and is organizing files into cabinets. She had 60 files and finished organizing half of them this morning. She has another 15 files to organize in the afternoon and the rest of the files are missing. How many files are missing?
Edith has already organized 60 files / 2 = 30 files in the morning. She has files left to organize so she must still have 30 + 15 = 45 files in the office. This means there are 60 total files – 45 organized files = 15 missing files.
The final answer: 15.