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In an online course (12) videos are uploaded in the first week and (4) more videos each next week. In which week will (60) videos be uploaded?

Answer and explanation

Correct answer: 13

This is an arithmetic progression with first term \(a=12\) and common difference \(d=4\). The number of videos in the \(n\)th week is \(a_n=12+(n-1)\times4\). Solving \(12+(n-1)\times4=60\) gives \(n-1=12\), so \(n=13\). Therefore, 60 videos will be uploaded in the 13th week. The close distractor 12 is incorrect because the 12th week has only \(56\) videos. Exam tip: in AP word problems, identify \(a\), \(d\), and the required \(a_n\) before forming the equation.

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermLinear SequenceClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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