Answer:
Book A has the greater mass: 1720 g versus 1680 g.
The difference in mass is 1720 g - 1680 g, or 40 g
Explanation:
Book A: Mass is 1000 g + 700g + 10 g, or 1720 g.
Book B: Mass is 1500 g + 100 + 80, or 1680 g.
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