In a camp there is food for 400 persons for 23 days-if 60 more persons join the camp find the number of days the provision will last.

The answer is 20 days.

After 60 people have joined there will be 460 people in the camp.

The number of days which the provisions will last will be proportional less after the 60 people have joined and will be:-

(400/460) * 23

= (20 / 23) * 23

= 20