Question: In a class of 5 students, average weight of the 4 lightest students is 40 kgs, Average weight of the 4 heaviest students is 45 kgs. What is the difference between the the maximum and minimum possible average weight overall?

Options: 

a) 2.8 kgs
b) 3.2 kgs
c) 3 kgs
d) 4 kgs

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