Question : Directions: Adam who is 20 years old is 4 times as old as Mary. What will be Mary's age when Adam is twice as old as her?
Option 1: 35 years
Option 2: 15 years
Option 3: 30 years
Option 4: 17 years
New: SSC CHSL Tier 2 answer key released | SSC CHSL 2024 Notification PDF
Recommended: How to crack SSC CHSL | SSC CHSL exam guide
Don't Miss: Month-wise Current Affairs | Upcoming government exams
New: Unlock 10% OFF on PTE Academic. Use Code: 'C360SPL10'
Correct Answer: 15 years
Solution :
Let us assume that after A years, Adam's age is twice the Mary's age; Adam's age after A years = (20 + A) years, and Mary's age after A years = (5 + A) years. Also, after A years, Adam’s age = 2 × Mary’s age ⇒ (20 + A) = 2(5 + A) ⇒ 20 + A = 10 + 2A ⇒ 20 – 10 = 2A – A ⇒ A = 10 years Therefore, Mary's age after 10 years will be 15 years, and Adam’s age after 10 years will be 30 years.
So, Mary's age after 10 years will be 15 years. Hence, the second option is correct.
Candidates can download this e-book to give a boost to thier preparation.
Result | Eligibility | Application | Admit Card | Answer Key | Preparation Tips | Cutoff
Question : Directions: Hema was twice as old as Geeta 10 years ago. How old is Geeta today, if Hema will be 40 years old 10 years henceforth?
Question : Directions: A was twice as old as B, two years ago. If the difference in their ages is 2 years, find A's age.
Question : Directions: A father said to his son, I was as old as you are at the present at the time of your birth. If the father's age is 52 years now, then the son's age 8 years back was?
Question : Directions: If the age of Rahul is 5 years more than his friend Ajay's age, the age of Rahul's wife is 6 years less than Rahul's, and Ajay's wife is 1 year older than Rahul's wife, then which of the following statements is true?
Question : The ratio of the father's age to his son's age is 5 : 3. The product of the numbers representing their ages is 960. The ratio of their ages after 6 years will be:
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile