In 2002, Meenu's age was one-third of the age of Meera, whereas in 2010, Meenu's age was half the age of Meera. What is Meenu's year of birth?
- A1992
- B1994Correct
- C1996
- D1998
Explanation
Let M_2002 and R_2002 be the ages of Meenu and Meera in 2002, respectively. Let M_2010 and R_2010 be the ages of Meenu and Meera in 2010, respectively.
From the first statement: In 2002, Meenu's age was one-third of Meera's age. M_2002 = R_2002 / 3 (Equation 1)
From the second statement: In 2010, Meenu's age was half the age of Meera. M_2010 = R_2010 / 2 (Equation 2)
The time difference between 2002 and 2010 is 8 years. So, M_2010 = M_2002 + 8 And R_2010 = R_2002 + 8
Substitute these into Equation 2: (M_2002 + 8) = (R_2002 + 8) / 2 2 * (M_2002 + 8) = R_2002 + 8 2 * M_2002 + 16 = R_2002 + 8
From Equation 1, we know R_2002 = 3 * M_2002. Substitute this into the above equation: 2 * M_2002 + 16 = (3 * M_2002) + 8
Now, solve for M_2002: 16 - 8 = 3 * M_2002 - 2 * M_2002 8 = M_2002
So, Meenu's age in 2002 was 8 years.
To find Meenu's year of birth, subtract her age in 2002 from the year 2002: Year of birth = 2002 - 8 = 1994.
Analyzing the options: A) 1992: Incorrect. If born in 1992, Meenu would be 10 in 2002. B) 1994: Correct. If born in 1994, Meenu would be 8 in 2002. C) 1996: Incorrect. If born in 1996, Meenu would be 6 in 2002. D) 1998: Incorrect. If born in 1998, Meenu would be 4 in 2002.
The final answer is B.

Related questions
More UPSC Prelims practice from the same subject and topic.
- Prelims 2019CSATQuantitative Aptitude
A and B are two heavy steel blocks. If B is placed on the top of A, the weight increases by 60%. How much weight will reduce with respect to the total weight of A and B, if B is removed from the top o…
- Prelims 2019CSATQuantitative Aptitude
When a runner was crossing the 12 km mark, she was informed that she had completed only 80% of the race. How many kilometres was the runner supposed to run in this event?
- Prelims 2019CSATQuantitative Aptitude
Raju has Rs. 9000 with him and he wants to buy a mobile handset; but he finds that he has only 75% of the amount required to buy the handset. Therefore, he borrows 2000 from a friend. Then
- Prelims 2019CSATQuantitative Aptitude
Rakesh and Rajesh together bought 10 balls and 10 rackets. Rakesh spent 1300 and Rajesh spent 1500. If each racket costs three times a ball does, then what is the price of a racket?
- Prelims 2019CSATQuantitative Aptitude
In an examination, A has scored 20 marks more than B. If B has scored 5% less marks than A, how much has B scored?
- Prelims 2019CSATQuantitative Aptitude
Ena was born 4 years after her parents' marriage. Her mother is three years younger than her father and 24 years older than Ena, who is 13 years old. At what age did Ena's father get married