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On a road the distance between the first two poles is (8) metres and each next distance increases by (3) metres. What is the distance of the (7)th gap?

Answer and explanation

Correct answer: 26 m

The successive gaps form an arithmetic progression with first term \(a=8\) m and common difference \(d=3\) m. The seventh gap is \(a_7=a+(7-1)d=8+6\times3=26\) m. Choosing \(23\) m would give the fifth gap, not the seventh. Exam tip: in \(a_n=a+(n-1)d\), use \(n-1\), not \(n\).

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermCommon DifferenceDistance ProblemsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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