How many students passed in both Mathematics and English?
(I) 15 failed in both Mathematics and English.
(II) The number of failures in Mathematics exceeds the number of failures in English by 10.

if the statement (I) alone is sufficient to answer the question, but (II) does not answer the question.

if the statement {II) alone is sufficient to answer the question but (I) does not answer the question.

if both the statements (I) and (II) are sufficient to answer the question but neither statement alone is sufficient.

if both the statements (I) and (II) together are not sufficient to answer the question and additional data is required.