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HUH? She started with 2 lbs. How could she possibly wind up with 19.2 lbs??? When you get an answer, at least check to see whether it makes sense!
2/5 * 2 = 4/5 = 0.8
3/10 * 2 = 3/5 = 0.6
So, she used 1.4 lbs of flour, leaving
2.0-1.4 = 0.6 left over
Hmmm. Maybe you meant she started with 20 lbs.
2/5 + 3/10 = 7/10
7/10 of 20 is 14, leaving 6 lbs.
From now on, show your work, so we can see the steps you took...