Problem number seven. A regular rectangular pattern on the wall was created with two kinds of tiles, gray and striped. Some tiles have fallen off the wall. See the picture. How many gray tiles have fallen off? Nine, eight, seven, six, or five. In order to help us solve this problem, here is a grid. The pattern of the tiles is gray, striped, So on the grid, we are going to fill in all the gray tiles that have fallen off. So starting at the second row, because that is where the tiles have begun to fall off. Now onto the third row. And then on the fourth row, we have striped, gray, striped, gray, striped, gray, striped. There are the tiles. One, two, three, four, five, six, seven, eight. So there are eight gray tiles that have fallen off, which means our answer is B, eight.

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