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Mathematics, 21.03.2021 14:40 mwms2018sg

Copper costs £5 per kilogram. Zinc costs £3.20 per kilogram.
Copper and zinc are mixed in the ratio 4:1 to make brass.
Work out the cost of 7 kilograms of brass

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Copper costs £5 per kilogram. Zinc costs £3.20 per kilogram.
Copper and zinc are mixed in th...
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