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See, 3 men or 6 boys = 20 days
3m or 6b = 20
or, 3m = 6b
4m + 12b =?
from , M×D = M'× D'
⇒6b ×20 = (4m +12b)×D'
⇒6b ×20 =(8b +12b)×D'
∵ (m =2b)
∴120b = 20b × D'
⇒D' =6 days
They will take 6 days to complete the same work.

Hope, this will help you :)