Interview Question for Engineering Program Manager at Apple:

First, I will try to figure out how important these 20 extra features, whether some or all of them are 'must have', 'should have','could have' or 'nice to have'. I would totally rule out any 'could have' or 'nice to have'. A project/program manager must have courage and conviction to say 'no'.
If some or all of those features are 'must have' or 'should have', then I will see what features in current project/program can be dropped in favor of the new features. use creative project/program planning or use overtime as much as possible without adding extra risk.
If none of the above is true, then extra resources or time must be negotiated. Through analysis of the situation and clear communication is key to achieve this objective.