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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsEasy
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A sweet shop sells (20) boxes on the first day and (4) more boxes each next day. How many boxes are sold on the (11)th day?

Answer and explanation

Correct answer: 60

The daily sales form an arithmetic progression (AP), with first term 20 and common difference 4. The 11th term is \(a_{11}=a+(11-1)d=20+10\times4=60\). Therefore, 60 boxes are sold on the 11th day. Choosing 56 would add the increase only 9 times, but there are 10 increases from the first day to the 11th day. Exam tip: use \(a_n=a+(n-1)d\) for the nth term.

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermClass 10 MathematicsSequence ApplicationWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap
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