math

A ball and a box weigh 900 grams.
Two identical balls and the same box weigh 1.35kg.
What is the mass of the box?

How do I work this out?

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  1. 1.35kg = 1350g = 900+450g
    2 balls and a box weight 450g more than one ball and the box.
    So, a ball weighs 450g
    Since a ball and a box weigh 900g, the box also weighs 450g.

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