Balraj can paint a house in 12 days and Kusum can paint it in 18 days. They work on alternate days: Balraj on the first day, Kusum on the second, Balraj on the third, and so on. In how many days will the house be painted?
14 2/5 days
14 1/2 days
7 1/5 days
14 1/3 days
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