Aman can do a work in 16 days and Shyam in 20 days. In how many days they, work together will do the double work?

Aman can do a work in 16 days and Shyam in 20 days. In how many days they, work together will do the double work?

1). 5
2). 160/9
3). 4
4). 80/9

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