self Maths Puzzle

In an Entrance examination, a multiple choice question has 5 options. If Rohit chooses the correct option, he earns 4 marks and for choosing the wrong option incurs negative marks. If Rohit chooses an option randomly, his expected score is 0. Suppose Rohit has successfully eliminated 3 incorrect options. What will be the expected score if he chooses randomly among the remaining options ?

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self Other Question

Ashok got thrice as many sums wrong as he got right. If he attempted 60 sums in all, how many sums did he solved correctly? shyam has to secure 40% marks to pass his B.tech final exams.He got just 40 marks and failed by 40-marks.What is the maximum marks ?