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 Form 4 Mathematics Paper 1 Solved Questions

Two coils which are made by winding aluminium wire of different gauges and length have the same mass.The first coil is made by winding 270 metres of wire with cross-sectional diameter 2.8mm while the second coil is made by
winding a certain length of wire with cross-sectional diameter 2.1mm.Find the length of the wire in the second coil.

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