MBA Exam

There are two circular tables in a room placed side by side. Each table has 4 seats placed in identical orientations around the table such the the entire setup may be considered a mirror image setup.The concierge had been given a plan sheet with 4 particular ways to seat the 8 guests at the table. However, the concierge lost the paper.What are the chances of the concierge getting the the seating right, considering he does not remember anything of the seating plan.

1) 1 in (4*7!)
2) 1 in (7!)
3) 1 in (7!/4)
4) 1 in (8!)

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MBA Other Question
A tank of height 3m has capacity of 225 litres.three pipes each having capacity to empty the tank at 5Litres per minute are at height of 0m,1m and 2m from base.How much time will they take to empty the tank?

A two-digit number, with non-zero digits, has its units digit divisible by its tens digit. The number is divisible by the average of its digits. How many possible values can the ratio of the units digit and the tens digit assume?(Guide me for the approch, Puys for this 1)

1) 2
2) 3
3) 4
4) 5
5) 6