Mr perez earned $320 this week working 40 hours. how many more hours would he have to work to earn $416?

Find out how much he makes per hour.
Ex. $320/40 hours = $8 per hour

Find out how many hours he must work to make $416.
Ex. $416/ $8 per hour = 52 hours

Find the difference between 52 hours and 40 hours (the problem asks how many more hours).
Ex. 52 hours - 40 hours = 12 hours

12 more hours

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.