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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsEasy
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A newspaper seller sells (80) newspapers on the first day and (10) more newspapers each next day. How many newspapers are sold on the (9)th day?

Answer and explanation

Correct answer: 160

The daily sales form an arithmetic progression (AP), with first term \(a=80\) and common difference \(d=10\). The sales on the ninth day are \(a_9=a+(9-1)d=80+8\times10=160\). Getting \(170\) would incorrectly add the increase 9 times; there are only 8 increases after the first day. Exam tip: use \(a_n=a+(n-1)d\) for the \(n\)th term.

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics
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