Respuesta :

let 1 box = x
let 1 tin = y
let 1 bottle = z

2x = y
2y = z isolate for y = z÷2

2x = z ÷ 2
4x = z

so 4 boxes weigh as 1 bottle.

y + z = 2x + 2y = 2x + 2 (2x) = 2x + 4x = 6x

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