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In a parking area the first row can hold (15) cars and each next row can hold (5) more cars. What is the total capacity of (8) rows?

Answer and explanation

Correct answer: 260

The row capacities form an AP: 15, 20, 25, ... . Here, \(a=15\), \(d=5\), and \(n=8\). Therefore, \(S_8=\frac{8}{2}[2(15)+(8-1)5]=4(65)=260\). Hence, the total capacity is 260 cars. A result such as 270 comes from an error in counting the terms or applying the common difference. Exam tip: identify \(a\), \(d\), and \(n\) before using the AP sum formula.

Related tags

Arithmetic ProgressionAp Word ProblemsSum Of N TermsClass 10 MathematicsParking CapacityWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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