The problem given below consists of a question and two statements numbered I and II. You have to decide whether the data provided in the statements are sufficient to answer the question.
How many sisters does Sunny have?
I. Sunny is the only son of his parents.
II. Sunny's parents have three children.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Statements I and II together are sufficient to answer the question.
Each statement is first tried on its own, and only then the two together.
Statement I alone: Sunny is the only son, so every other child is a daughter, but the number of children is not known. Not sufficient.
Statement II alone: there are three children, but how many are sons is not known. Not sufficient.
I and II together: three children, of whom only Sunny is a son, so the other two are daughters. Sunny has 2 sisters. Sufficient.