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A farmer sells (32) kg fruit in the first week and (6) kg more each next week. How much fruit will he sell in (8) weeks?

Answer and explanation

Correct answer: 424

This is an arithmetic progression with first term \(a=32\), common difference \(d=6\), and \(n=8\) terms. Thus, \(S_8=\frac{8}{2}[2(32)+7(6)]=4(64+42)=424\). Therefore, the farmer sells 424 kg of fruit in 8 weeks. Getting 432 usually results from incorrectly counting the number of differences or terms. Exam tip: use \(n-1\) in the AP sum formula.

Related tags

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

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