Answer:
14
Explanation:
If 8 bucketfuls of the green one is used, that makes it 28 gallons (3.5×8)
It's asking you how many bucketfuls you need to obtain the same aount of water. And the amount of water is 28 gallons. So how will you know how many bucketfuls of the orange you need to obtain 28 gallons? Just maths
For orange:
2 gallon = 1 bucketful
1 gallon = ½ bucketful
28 gallons = 14 bucketful (28×½ which also equals 28÷2)