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(a + b + c + d + e)/5 = 3
=> a + b + c + d + e = 15   … (1)

Now, (a + b + c + d  + e + f)/6 = 4
=> a + b + c + d + e + f = 24  … (2)

So (2) – (1):

f = 24 – 15  = 9

So mass of the new box is 9 kg #

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