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1 dozen rolls = 12 rolls

Let x = the number of rolls needed.

(12 rolls)(1 person / roll)x = 150 people

12x = 150

x = 12.5

However, if you can only buy dozens in whole numbers (and you can't buy half a dozen, for example), you should round up.

So you would need 13 dozen dinner rolls.

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Q: How many dozen dinner rolls are needed to serve 150 people one roll each?
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