The total number of females working in factory F2 per day during Days D1, D2, D3 = 186 + 212 + 224 = 622 ⇒ The average of females working in factory F2 per day during Days D1, D2, D3 = 622/3 ⇒ The total number of females working in factory F1 per day during Days D4, D5, D6 = 328 + 336 + 444 = 1108 ⇒ The average of females working in factory F1 per day during Days D4, D5, D6 = 1108/3 ⇒ Required ratio = 622/3 : 1108/3 = 311 : 554 ∴ Required ratio is 311 : 554