Jenny is working on a school project. She spends 10 hours doing research for the project and 2 hours writing a proposal. If she has 20 hours total to work on the project, how many hours does she have left to write her report?
So far, Jenny has spent 10+2=<<10+2=12>>12 hours on the project.
Thus, she has 20-12=<<20-12=8>>8 hours to write her report.
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