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I Need Help Finding The Two Equations Needed For This Question

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Elena_W | 18:13 Sun 13th Sep 2015 | Jobs & Education
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I just don't understand this question, I've been stuck on it for so long, please help me. A cafe sells 2 types of coffee, one for $7.90/kilo, the other for $9.40/kilo. If the store owner mixes 20 kilos and intends to sell the mixture for $8.5/kilo. To make the same revenue as if the 2 brands were mixed how many kilos of each should she use?

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12 kg of the $7.90 coffee mixed with 8 kg of the $9.40 coffee will return 20 kg of a coffee mix that is worth $8.5/kg

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