Question: Break down this math problem: Shiela is required to submit a 15-page research paper. She already finished writing 1/3 of the paper. How many pages does she have left to write?
Answer: 
Shiela has already written one third of the paper which is 15 pages x 1/3 = 5 pages.
So, she still needs to write 15 pages - 5 pages = 10 pages.