MBA Exam

the average marks of all students who passed in a test is 65% and those who failed is 30%. if the average of all students is 50% then find what % of students passed the test?solution please!!!

1) 57 1/7
2) 62 1/2
3) 42 6/7
4) 37 1/2

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MBA Other Question
We have 3 pairs of socks to start with and 2 socks go missing. What are the chances that we have 2 complete pairs of socks left? What are the chances that we have only 1 complete pair left?

1) 0.2 & 0.8
2) 0.2 &0.2
3) 0.5 & 0.5
4) 0.4 & 0.6
 Let z = 1 + 2 + 3 + ….. + 200; x = sum of the number at odd places and y = sum of the number at even places, then what is the value of y / x?

1) 1.1
2) 2.1
3) 2.01
4) 1.01