Gaurav, Parit and Gaggi can do a work in 20, 30 and 60 days respectively. How many days does it need to complete the work if Gaurav does the work and he is assisted by others on every alternate day?

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Gaurav, Parit and Gaggi can do a work in 20, 30 and 60 days respectively. How many days does it need to complete the work if Gaurav does the work and he is assisted by others on every alternate day?