Question
Warren wanted to buy some barley. He will have $12 left if he buys 2 kg of barley. However, he will need $4 more to buy 4 kg of barley. What is the cost of 9 kg of barley?
4 m

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Warren wanted to buy some barley. He will have $12 left if he buys 2 kg of barley. However, he will need $4 more to buy 4 kg of barley. What is the cost of 9 kg of barley?