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A medicine dose is (10) mg on the first day and increases by (5) mg each next day. What is the dose on the (6)th day?

Answer and explanation

Correct answer: 35 mg

The doses form an arithmetic progression with first term \(a=10\) mg and common difference \(d=5\) mg. The dose on day \(n\) is \(a_n=a+(n-1)d\). Thus, \(a_6=10+(6-1)\times5=35\) mg. Option A results from counting too few increases. Exam tip: In the \(n\)th-term formula of an AP, the number of increases is always \(n-1\).

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermCommon DifferenceClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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