What is the present age of A? Statement I: Five years ago, A was twice as old as B. Statement II: The present age of B is $15$ years. Choose the standard data-sufficiency option.
Practice this question from Chapter Mock 16: Data Sufficiency, with options and an explanation.
Question
What is the present age of A?
Statement I: Five years ago, A was twice as old as B.
Statement II: The present age of B is $15$ years.
Choose the standard data-sufficiency option.
Option A
A
Option B
B
Option C — Correct answer
C
Correct choice.
Option D
D
Option E
E
Explanation
Statement I alone is insufficient because B is unknown. Statement II alone is insufficient because A is unknown. Together, five years ago B was $10$, so A was $20$, making A now $25$. Hence the answer is C.