Dear all,
I would like to know which of the following expressions is correct.
He used to smoke 20 cigarettes in a day.
He used to smoke 29 cigarettes a day.
Thank you.
cat navy 425 He used to smoke 29 cigarettes a day. This one. "A" means "per" there.
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cat navy 425He used to smoke 29 cigarettes a day.
This one. "A" means "per" there. This is not really the indefinite article. It derives from "an", an old spelling of "in".
The other is not so much wrong as unexpected with no good reason for the change. You see it sometimes.