To find the least possible number of bottles of equal size, we calculate the HCF (Highest Common Factor) of the given quantities. Calculation: Find the HCF of 493,551 , and 609 : Prime factorization: 493=17×29 551=19×29 609=3×29×7 Common factor =29 HCF = 29 liters (bottle size) Number of bottles required: ⇒ Total bottles =(493∕29)+(551∕29)+(609∕29) ⇒ Total bottles =17+19+21 ⇒ Total bottles =57