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In a training plan (40) push-ups are done on the first day and (3) more push-ups are done each day. How many push-ups will be done on the (30)th day?

Answer and explanation

Correct answer: 127

This forms an arithmetic progression with first term \(a=40\), common difference \(d=3\), and \(n=30\). Using \(a_n=a+(n-1)d\), we get \(a_{30}=40+(30-1)\times3=40+87=127\). Therefore, 127 push-ups will be done on the 30th day. The option 130 results from incorrectly using \(n\) instead of \(n-1\). Exam tip: From the first term to the \(n\)th term, the common difference is added \(n-1\) times.

Related tags

Arithmetic ProgressionNth TermAp Word ProblemSequence FormulaClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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