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In a tank, (8) litres of water are filled in the first minute and (2) litres more in each next minute. How much water is filled in the (10)th minute?

Answer and explanation

Correct answer: \(26\ \text{L}\)

The amount filled each minute forms an arithmetic progression. Here, the first term is \(a=8\) and the common difference is \(d=2\). Thus, \(a_{10}=a+(10-1)d=8+9\times2=26\). Therefore, \(26\ \text{L}\) of water is filled in the 10th minute. \(24\ \text{L}\) would be the amount filled in the 8th minute, not the 10th. Exam tip: use \(a_n=a+(n-1)d\) to find the \(n\)th term of an AP.

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermClass 10 MathematicsCommon DifferenceWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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