Question
Mrs Lau has to pay $21 for 2 kg of beef and 3 kg of mutton. She has to pay $30 if she buys 3 kg of beef and 4 kg of mutton. How much does 1 kg of beef cost?
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Mrs Lau has to pay $21 for 2 kg of beef and 3 kg of mutton. She has to pay $30 if she buys 3 kg of beef and 4 kg of mutton. How much does 1 kg of beef cost?