1 yard is three feet long
Easy math from there
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1 yard = 3 feet So Number of yards in 93 feet = 93/3 = 31
three feet are in one yard
Multiply feet by 12 to get inches. For example 2 feet = 2 x 12 = 24 inches 5 feet = 5 x 12 = 60 inches ... ... 10 feet = 10 x 12 = 120 inches ... ... n feet = n x 12 = 12n inches
[(n-1)*(n-2)]/2.
n(n-3)/2