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In a class, the first group has (5) students and each next group has (5) more students. How many students are in the (6)th group?

Answer and explanation

Correct answer: 30

The numbers of students form an arithmetic progression: 5, 10, 15, 20, 25, 30. Here, the first term is \(a=5\), the common difference is \(d=5\), and \(n=6\). Thus, \(a_6=a+(6-1)d=5+5\times5=30\). Therefore, 30 is correct. The value 25 belongs to the fifth group, not the sixth. Exam tip: use \(n-1\) in the formula for the \(n\)th term of an AP.

Related tags

Arithmetic ProgressionNth TermAp Word ProblemsClass 10 MathematicsCommon DifferenceWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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