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Is that the entire question?
24 - 20 = ?
24 - 20 = ?
Since 1 yard is equal to 3 feet, we can multiply the number of yards by 3 to get the number of feet.
Patty originally bought 24 yards of fencing, so we have:
24 yards * 3 feet/yard = 72 feet.
This means Patty originally had 72 feet of fencing.
She only used 20 yards of fencing, so we can calculate the amount of fencing she has left over by subtracting the amount she used from the total amount.
72 feet - (20 yards * 3 feet/yard) = 72 feet - 60 feet = 12 feet.
Therefore, Patty has 12 feet of fencing left over.