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A farmer sells (40) kg vegetables in the first week and (10) kg more each next week. How much will he sell in the (5)th week?

Answer and explanation

Correct answer: 80 kg

The weekly sales form an arithmetic progression with first term \(a=40\) kg and common difference \(d=10\) kg. Therefore, the fifth-week sale is \(a_5=a+(5-1)d=40+4\times10=80\) kg. Choosing \(90\) kg incorrectly adds the increase five times; there are only four increases after the first week. Exam tip: use \(a_n=a+(n-1)d\) for the \(n\)th term.

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermCommon DifferenceClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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