Question
Lucy bought 9 kg of beef and 6 kg of mutton for $144. If she brought 6 kg of beef and 9 kg of mutton, she would have to pay $18 less. How much did 1 kg of beef cost?
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Lucy bought 9 kg of beef and 6 kg of mutton for $144. If she brought 6 kg of beef and 9 kg of mutton, she would have to pay $18 less. How much did 1 kg of beef cost?