4 goats = 6 sheep ⇒ 2 goats = 3 sheep. So, 2 goats and 9 sheep = 3 sheep + 9 sheep = 12 sheep (equivalent) Now, number of days for 6 sheep to graze the field = 50 days Therefore, the number of days required for 12 sheep to graze the field =
50×6
12
=25 So, 2 goats and 9 sheep can graze the field in 25 days.