A pool has 1,000 gallons of water in it, and a hose is filling the pool with 10 gallons per minute.
a) Write an equation for the total volume of water V in the pool after x minutes.
b) How many hours will it take to fill the pool to 10,000 gallons?

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.