human
Betty bought 1 kg of oranges and 3 kg of apples. The total cost of oranges was $12. The apples were two times cheaper than the oranges. How much did Betty pay for 1 kg of apples?
assistant
How much did the apples cost? ** The cost of the apples was $12 / 2 = $<<12/2=6>>6.
How much did Betty pay for 1 kg of apples? ** When the cost of 3 kg of apples was $6, then the cost of 1 kg of apples was $6 / 3 kg = $<<6/3=2>>2/kg.
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