Mr. Kim's cell phone bill shows that the average length of each of his phone calls was 1/5 hour. The bill also shows that he spent a span of 4 hours on the phone. How many calls did he make?

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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.