1.

Among four students sitting in a row, average age of last three students is 20 years and the average age of first three students is 21 years. If the age of first student is 26 years, then what is the age (in years) of the last student?1). 232). 373). 244). 29

Answer»

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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