In a test, Randhir obtained more marks than the total marks obtained by Kunal and Debu. The total marks obtained by Kunal and Shankar are more than those of Randhir. Sonal obtained more marks than Shankar. Neha obtained more marks than Randhir. Who amongst them obtained highest marks?

• Let R, K, D, S, and N represent the marks of Randhir, Kunal, Debu, Shankar, and Neha respectively.

• The condition 'Randhir obtained more marks than the total marks obtained by Kunal and Debu' implies R > K + D.

• The condition 'The total marks obtained by Kunal and Shankar are more than those of Randhir' implies K + S > R.

• Combining these, we know R is greater than K+D but less than K+S, which establishes that S > D, but does not fix the absolute value of S relative to R or N.

• We are given N > R and S > R (since K+S > R and K is positive, S must be less than R+K, but actually S could be less than R if K is large enough? No, K+S > R. If K is small, S > R. If K is large, S can be < R. Example: R=100, K=90, D=5 (100>95), S=11 (90+11=101>100). Here S < R. Another example: R=100, K=10, D=5 (100>15), S=95 (10+95=105>100). Here S > R.

• Since S can be either greater than or less than R, and we only know N > R, we cannot determine if N is greater than S or if S is greater than N.

• Therefore, the data is inadequate to determine who obtained the highest marks.