An art gallery has 18 paintings and 4 photographs displayed in equal rows on a wall, with the same number of each type of art in each row. What could be the number of rows??
The paintings and photographs can be sorted into rows of two.18/2=9, so there would be 9 rows each with two paintings. 4/2=2, so there would be 2 rows with 4 photos. 9+2=11 rows in all :)
