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A farmer plants (11) trees on the first day and (4) more trees each next day. How many trees will he plant on the (10)th day?

Answer and explanation

Correct answer: 47

The numbers of trees planted each day form an AP with first term \(a=11\) and common difference \(d=4\). The \(n\)th term is \(a_n=a+(n-1)d\). Therefore, \(a_{10}=11+(10-1)\times4=11+36=47\). Hence, 47 is correct. Getting 45 would result from using the number of intervals incorrectly. Exam tip: for the \(n\)th term of an AP, multiply the common difference by \((n-1)\).

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermClass 10 MathematicsSequence ApplicationsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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