Read the given information carefully and answer the related questions:
Seven persons K, L, M, N, O, P and Q - were born (not in given order) on same date of same month but in different year – 1955, 1961, 1972, 1987, 1998, 2006, 2017. Consider base year 2025 for age calculation.
M’s age is the cube of a number. 11 years difference between M and K. Three persons are in between K and P. N is 32 years older to Q. L’s age is the cube of a number. Age difference between L and K is more than 10 years.
Who among the following was born in 1972?
Correct Answer :
K
Solution :
To find out who was born in 1972, let us calculate the age of each person with respect to the base year 2025.
The birth years given are: 1955, 1961, 1972, 1987, 1998, 2006, 2017.
Let's calculate the ages of individuals born in these years as of 2025:
- Born in 1955: 2025 - 1955 = 70 years old
- Born in 1961: 2025 - 1961 = 64 years old
- Born in 1972: 2025 - 1972 = 53 years old
- Born in 1987: 2025 - 1987 = 38 years old
- Born in 1998: 2025 - 1998 = 27 years old
- Born in 2006: 2025 - 2006 = 19 years old
- Born in 2017: 2025 - 2017 = 8 years old
Now, let's analyze the given clues:
1. "M’s age is the cube of a number."
Looking at the ages (70, 64, 53, 38, 27, 19, 8), the perfect cubes are:
So, M's age can be 64, 27, or 8.
2. "L’s age is the cube of a number."
So, L's age can also be 64, 27, or 8 (distinct from M's age).
3. "11 years difference between M and K."
Let's check the possibilities for M's age (64, 27, 8) and find K's corresponding age:
- If M = 64, K can be 64 - 11 = 53 (which is in our list) or 64 + 11 = 75 (not in list). So if M = 64, then K = 53.
- If M = 27, K can be 27 - 11 = 16 (not in list) or 27 + 11 = 38 (which is in our list). So if M = 27, then K = 38.
- If M = 8, K can be 8 + 11 = 19 (which is in our list). So if M = 8, then K = 19.
4. "Three persons are in between K and P" when arranged by age/birth year.
Let's list the birth years in chronological order:
1st: 1955 (70)
2nd: 1961 (64)
3rd: 1972 (53)
4th: 1987 (38)
5th: 1998 (27)
6th: 2006 (19)
7th: 2017 (8)
If three persons are between K and P, the positions of K and P must be (1st and 5th), (2nd and 6th), or (3rd and 7th).
Let's test the possibilities for K's age:
- If K = 53 (3rd position), then P must be in the 7th position (age 8). Let's check this case:
Since K = 53, M must be 64.
This leaves L's age to be either 27 or 8. But P is 8, so L must be 27.
Let's check if the difference between L (27) and K (53) is more than 10 years: 53 - 27 = 26, which is indeed more than 10 years.
- Let's check: "N is 32 years older to Q."
The remaining ages for N, O, Q are 70, 38, 19.
We need a difference of 32 years between N and Q: 70 - 38 = 32. Thus, N must be 70 and Q must be 38.
This leaves O to be 19.
All conditions are perfectly satisfied in this case.
Thus, the age of K is 53 years, which corresponds to the birth year 1972.
Therefore, the person born in 1972 is K.
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