The 36 inches. There are 2 significant figures. The error in measurement might vary from 35.5 inches to 36.49999 inches.
With 3 ft, the potential error is greater. It might have been actually 3.04 ft, then just rounded to 3. Note that 3.04 feet equals 37.44 inches.
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3 ft
3 ft = 1 yd 6 ft = 2 yd 9 ft = 3 yd . . 36 ft = 12 yd
9 ft : 36 inches = 9 ft : 3 ft = 9:3 = 3:1
3 ft = 36 inches. So 3 ft / 18 in = 36 in/18 in = 1/2
Convert to same units then compare 1 ft = 12 in →3 ft = 3 × 12 = 36 in 36 > 3 → 36 in > 3 in → 3 ft > 3 in. 3 feet are greater than 3 inches.