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b + 1u + 2.88 = b + 5u. So u = 2.88/4 = 0.72 kg.

Since 5u = 3.60 kg = 3600 g, 40 books each weigh 3600/40 = 90 g.

So 90 g is 3/4 the mass of box, box is 120 g.

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When the box is full it still weighs 120 g, since the books supply the additional mass and it is still the same box. Haha.

Unless they mean box + books, in which case it is 120 g + 3600 g = 3720 g.

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Thanks for the help. Yes, think they mean box plus books 🙂

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