CAT Exam Numerical Ability

Q.Two horses are sold for Rs1955 each.The first one is sold at 15% profit and other one at 15% loss.what is the total profit or loss?

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CAT Other Question

A Lady invites 30 guests for dinner.The no of ways the guest can be accommodated on two round tables 13 on one and 17 on another. the number 1,2,3......40 are written on blackboard. the following operation is then repeated 39 times .in each repetition any two number say and b currently on the blackboard are erased and a new number a+b-1 is written what will be the number left on the blackboard at the end.
options
a) 820 b)821 c)781 d)819 e)780