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Among four students sitting in a row, the average age of the last three students is 20 years and the average age of the first three students is 21 years. If the age of the first student is 26 years, then what is the age (in years) of the last student?
  • a)
    23
  • b)
    37
  • c)
    24
  • d)
    29
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Among four students sitting in a row, the average age of the last thre...
Let the four students be a, b, c, d
Sum of age of the last three students (b + c + d) = 20 × 3 = 60      ----(1)
Sum of age of the first three students (a + b + c) = 21 × 3 = 63     ----(2)
Subtraction Equation 2 with Equation 1, we get (a - d) = 3
Given age of the first student ‘a’ = 26
Age of the last student ‘d’ = a – 3 = 26 – 3 = 23
∴ Required answer = 23
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Most Upvoted Answer
Among four students sitting in a row, the average age of the last thre...
Given information:
- There are four students sitting in a row.
- The average age of the last three students is 20 years.
- The average age of the first three students is 21 years.
- The age of the first student is 26 years.

To find:
- The age of the last student.

Let's solve the problem step by step:

1. Find the sum of the ages of the last three students:
- The average age of the last three students is 20 years.
- So, the sum of their ages would be 20 * 3 = 60 years.

2. Find the sum of the ages of the first three students:
- The average age of the first three students is 21 years.
- So, the sum of their ages would be 21 * 3 = 63 years.

3. Find the age of the last student:
- The sum of the ages of the first three students is 63 years.
- The age of the first student is 26 years.
- So, the age of the last student would be the difference between the sum of the ages of the first three students and the age of the first student.
- Age of the last student = 63 - 26 = 37 years.

Therefore, the age of the last student is 37 years.
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Among four students sitting in a row, the average age of the last three students is 20 years and the average age of the first three students is 21 years. If the age of the first student is 26 years, then what is the age (in years) of the last student?a)23b)37c)24d)29Correct answer is option 'A'. Can you explain this answer?
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