At least 3 bags will be required to pack the fruit in equal amount. Step-by-step explanation: Given: Number of apples she buys =15 Number of oranges she buys = 18 Number of mangoes she buys = 21 we need to find the least possible number of bags used. Solution: To find the least possible number of bags required we will find the prime common factor. Multiples of 15 = Multiples of 18 = Multiples of 21 = so we can say that; Highest common prime factor in all three numbers is 3. Hence At least 3 bags will be required to pack the fruit in equal amount.