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If the thickness of a pile of 12 cardboards is 35 mm, find the thickness of a pile of 294 cardboards.

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Thickness of `12` cardboard `=35` mm
Thickness of `1` cardboard `= 35/12` mm
Thickness of `294` cardboard
`= 35/12 xx 294`
`=857.5` mm
`=85.75` cm
The thickness of a pile of `294` cardboards is `857.5` mm.
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