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A student learns (10) words on the first day and (5) more words each next day. How many words will he learn on the (8)th day?

Answer and explanation

Correct answer: 45

The daily number of words forms an arithmetic progression with first term \(a=10\) and common difference \(d=5\). On the \(8\)th day, \(a_8=a+(8-1)d=10+7\times5=45\). Option 40 counts only 6 increases, whereas reaching the 8th term requires 7 increases. Exam tip: use \(a_n=a+(n-1)d\) for the \(n\)th term of an AP.

Related tags

Arithmetic ProgressionNth TermAp Word ProblemsClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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