Discussion

Explanation:

Total number of guests checking-in on 5th and 6th is 40 + 30 = 70.

Of these 70 guests, guests who have checked out on 6th and 7th is 25 + 23 = 48

∴ 70 - 48 = 22 guests staying till 8th are those whose checked-in on 5th or 6th.

Now 35 guests leave on 8th. To minimize guests checking in on 7th and checking-out on 8th we will maximize guests who checked out on 8th but checked-in on 5th or 6th.

∴ Out of 35 guests checking out on 8th maximum 22 guests were from 5th or 6th.

⇒ Minimum, 35 – 22 = 13 guests who checked in on 7th will have to check out on 8th.

Hence, option (b).

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