1 yard = 3ft
1 foot = 1/3 yard
6 feet = 1/3 * 6 = 2 yards
ratio of feet to yard = 6/2 = 3/1 = 3:1
12 feet = 1/3 * 12 = 4 yards
ratio of feet to yard = 12/4 = 3/1 = 3:1
15 feet = 1/3 * 15 = 5 yards
ratio of feet to yard = 15/5 = 3/1 = 3:1
24 feet = 1/3 * 24 = 8 yards
ratio of feet to yard = 24/8 = 3/1 = 3:1
Each ratio is 3:1