A garrison has provision for 30 days for certain men. If 2/3 of them do not attend the mess then the food will last for?

Answer: 90 days
Explanation

If 2/3 of the men do not attend the mess, that means only 1/3 of the men are attending the mess.

Since the provision is for 30 days for the entire group, the food will now last three times as long, since only one-third of the group is consuming it.

So, the food will last for 30 x 3 = 90 days.

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