Answer: Melvin's backpack is 2.33 lbs heavier
Explanation:
Convert the fractions to decimals (personal preference there)
2/3 = 0.666
3/9 = 0.333
3.66-1.33=2.33
11/3-4/3=7/3 or 2 1/3.
Note: 1 3/9 simplifies to 1 1/3.
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