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Explanation:
Since, Ram can do a piece of work in 6 days
Therefore, One day’s work of Ram = 1\6
Shyam can finish the same work in 12 days
Therefore One day’s work of Shyam = 1\12
Hence, one day’s work of them, if they work together
1\6+1\12=2+1\12=3\12=1\4
Therefore, Two days’ work of them = 1\4×2=1\2
Thus, if they work together for 2 days, then half of the work will be finished.