Jessica decides to mix grades of gasoline in her truck. she puts in 10 gallons of regular and 6 gallons of premium for a total cost of $33.12 . if premium gasoline costs $0.24 more per gallon than regular, what was the price of each grade of gasoline?

You will have to divide

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.