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Sylvia paid $4.20 for 2kg of sugar and 4 kg of flour. If 1 kg of sugar and 1 kg of flour cost $1.50, find the cost of 1 kg of flour.

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cost of sugar --- $x per kg
cost of flour --- 1.5 - x per kg

2x + 4(1.5-x) = 4.2
solve for x

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