A question is given, followed by two statements I and
II. Select which of the statement(s) is/are sufficient to answer the question. Question: How many captains are there between Winnie and Dyson in a row of captains, all facing north? Statements:
I. Winnie is 15th from the extreme left end of the row.
II. Dyson is exactly in the middle of the row and there are ten captains to his right.

Solution

Statement-I: Winnie is 15th from the extreme left end of the row.   Statement-II: Dyson is exactly in the middle of the row and there are ten captains to his right.   So, Dyson ranks 11th from the left.   When combining Statement I and II:   Total captains between Winnie and Dyson = Winnie’s rank from left – Dyson’s rank from left – 1 Total captains between Winnie and Dyson = 15 – 11 – 1 = 15 – 12 = 3   So, there are 3 captains between Winnie and Dyson. Thus, both I and II together are sufficient. Hence, the correct answer is (D).