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A machine produces (80) units in the first hour and (12) more units each next hour. What is the production in the (14)th hour?

Answer and explanation

Correct answer: (236)

The hourly production forms an arithmetic progression because the machine adds the same number of units, 12, every hour. Here the first term is 80, the common difference is 12, and the 14th hour means the 14th term. The term formula is \\(a_n=a+(n-1)d\\), so \\(a_{14}=80+(14-1)12=80+156=236\\).

Therefore, option B, 236, is correct. It is important not to multiply 14 directly by 12, because the first hour already starts at 80 and only the next 13 hours add an increase. The sequence begins 80, 92, 104 and continues with a constant difference of 12. Treating the hour number as the term number gives the required production.

Related tags

ApWord-ProblemMachineNth-Term

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