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Explanation:
You need 11*6 = 66 feet of ribbon overall.
Each roll comes in 24 ft, so 66/24 = 2.75 which rounds to 3
If you bought 2 rolls, then 2*24 = 48 feet isn't enough. Buying 3 rolls means you get 3*24 = 72 feet. It's better to overshoot the goal than come up short. This way you'll have extra just in case there's a mistake somewhere.
