Why is this the answer?

The answer is six because this clever riddle is a fun math puzzle hidden in a poem! To figure it out, we must check each line, like following a set of clues one after the other. Let us begin with the first line: "Double my number, I'm less than a score." The word "score" is a very old way to say the number 20. If we take our number, six, and double it, we get twelve. Since twelve is certainly less than twenty, the number six passes the first test! The next line gives us another clue about the size of the number: "Half of my number is less than four." When we find half of six, the answer is three. We know that three is less than four, so this clue works perfectly with our number six, too! Now for a slightly tricky line: "Add one to my double when bakers are near." We already found that double our number is twelve. When you add one to twelve, you get thirteen. Bakers sometimes sell a "baker's dozen," which is another name for thirteen. This clue cleverly points to the number thirteen being important, and our number six leads right to it! The last part of the riddle says, "Days of the week are still greater, I fear." There are seven days in a week: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday. Our number, six, is smaller than seven. Since seven is greater than six, all of the clues in the riddle work perfectly together for the number six. That is why six is the correct answer to this playful word puzzle.