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In a computer lab (6) computers are installed on the first day and (4) more computers are installed each next day. How many computers are installed in (6) days?

Answer and explanation

Correct answer: 96

The numbers of computers installed each day form an AP: \(6, 10, 14, 18, 22, 26\). Here, \(a=6\), \(d=4\), and \(n=6\). Therefore, \(S_6=\frac{6}{2}[2(6)+(6-1)4]=3(32)=96\). Hence, 96 is correct. A value such as 108 can result from using an incorrect number of terms or last term. Exam tip: In word problems, identify the first term, common difference, and number of days before applying the AP sum formula.

Related tags

Arithmetic ProgressionAp Word ProblemsSum Of N TermsClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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