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In a practice plan (16) questions are solved on the first day and (4) more questions each next day. How many questions are solved in (8) days?

Answer and explanation

Correct answer: 240

This is an arithmetic progression with first term \(a=16\), common difference \(d=4\), and number of terms \(n=8\). Therefore, \(S_8=\frac{8}{2}[2(16)+(8-1)4]=4(32+28)=240\). Hence, 240 questions are solved in 8 days. A value such as 232 usually results from using the common difference or number of terms incorrectly. Exam tip: identify \(a\), \(d\), and \(n\) before applying the AP sum formula.

Related tags

Arithmetic ProgressionAp Word ProblemsSum Of N TermsClass 10 MathematicsSequence And SeriesWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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