X’s age 3 years ago was three times the present age of Y. At present, Z’s age is twice the age of Y. Also Z… · ABC26GN1844
Subject: General Aptitude · Chapter: Problems on Ages · Exam: IBPS—RRB Officer’s Gr. ‘B’ Exam 2015
X’s age 3 years ago was three times the present age of Y. At present, Z’s age is twice the age of Y. Also Z is 12 years younger than X. What is the present age of Z?
(a)15 year
(b)24 year
(c)12 year
(d)18 year
(e)6 year
Answer
Answer (as printed): D
Explanation
Let the present age of Y be a years. Three years ago X’s age = 3a years Then, present age of X is (3a + 3) Z’s present age = 2a According to the given information Now, (3a + 3) – 2a = 12 ⇒ a = 9 year ∴ Present age of Z = 2a = 2 × 9 = 18 years
Explanation as extracted from the printed page; notation may be imperfect.