The number of candy bars Sasha can eat is 3 times the amount her dog can eat. On a Monday in the month of January, Sasha and her dog ate a total of 40 bars. How many did Sarah eat? Show your work.

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.