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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsEasy
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In a tank (12) litres of water are filled in the first minute and (4) litres more in each next minute. How much water is filled in the (8)th minute?

Answer and explanation

Correct answer: 40 L

The amount filled each minute forms an AP with first term \(a=12\) and common difference \(d=4\). The amount filled in the eighth minute is \(a_8=a+(8-1)d=12+7\times4=40\) L. \(36\) L is the amount for the seventh minute, so it is a close but incorrect option. Exam tip: In \(a_n=a+(n-1)d\), use \(n-1\), not \(n\).

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermLinear SequenceClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap
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