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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsEasy
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In a tree plantation drive (18) trees are planted on the first day and (6) more trees each next day. How many trees are planted on the (7)th day?

Answer and explanation

Correct answer: 54

The numbers of trees planted each day form an AP with first term \(a=18\) and common difference \(d=6\). The seventh term is \(a_7=a+(7-1)d=18+6\times6=54\). Therefore, the correct answer is 54. Getting 48 would result from counting the number of increases incorrectly. Exam tip: use \(n-1\), not \(n\), when finding the \(n\)th term of an AP.

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermTree PlantationClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap
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