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A factory makes (350) items on the first day and production increases by (15) items each day. What is the production on the (22)nd day?

Answer and explanation

Correct answer: 665

This forms an arithmetic progression with first term 350 and common difference 15. The production on the 22nd day is \(a_{22}=a+(22-1)d=350+21\times15=665\). Getting 680 would mean adding 22 differences, but there are only 21 increases from day 1 to day 22. Exam tip: use \(a_n=a+(n-1)d\), paying close attention to \(n-1\).

Related tags

Arithmetic ProgressionNth TermWord ProblemProductionLinear SequenceFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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