MBA Exam

What is the largest possible number of elements in a subset S' of S = {1, 2, 3, ... , 9} such that the sum of every pair of distinct elements in S' is different?

1) 4
2) 5
3) 6
4) None of these

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MBA Other Question

Sam took a total of 4 hours to cover a round trip on a river. If he doubles his rowing speed, he would take 2.4 hours less to cover the round trip. What is the ratio of the speed of the stream to the intial rowing speed of Sam in still water?

1) 1:01
2) 1:02
3) 2:03
4) 3:04
A trader cheats both his supplier and customer by using false weights.while buying from his supplier,he takes 10%more than the indicated weight.when he sells to his customer,he gives the customer a weight such that if 10% of that is added to the weight,the weight claimed by the trader is obtained.if he charges the c.p of the weight that he claims,find his profit per.?pl. provide sol.

1) 20%
2) 21%
3) 21 1/3%
4) 22 2/9%