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How many questions did Joey attempt in a maths test having 25 question?

(1) Joey scored 16 marks
This gives us no idea about un-attempted answers.

(2) For every correct answer, Joey got 1 mark while for every incorrect answer, Joey lost 0.25 marks.
Again this marking scheme does not tell us anything about the number of questions attempted.

(1) and (2)
This gives us that with the given marking scheme, J scored 16 marks.
Now this can be done as:
(C= no. of correct answers, W= No. of Wrong answers, U= un-attempted answers)
16* C Hence U= 9
17*C , 4*W Hence U= 4
Hence insufficient

IMO Ans E
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