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Subjects
Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsHard
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In a cleanliness campaign (9) lanes are cleaned on the first day and (4) more lanes are cleaned each next day. How many lanes are cleaned in (19) days?

Answer and explanation

Correct answer: (855)

The lane numbers are (9,13,17,\ldots) and (S_{19}=855). Exam tip: treat a sequence with equal increase as an AP.

Related tags

ApWord-ProblemCleanlinessTotalWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics
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