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A machine produces (120) units in the first hour and (18) more units each next hour. What is the production in the (16)th hour?

Answer and explanation

Correct answer: (390)

The first-hour production is the first term of an arithmetic progression. Here the first term is \\(a=120\\), the common difference is \\(d=18\\), and the 16th hour means the 16th term. The nth-term formula is \\(a_n=a+(n-1)d\\). Substituting the values gives \\(a_{16}=120+(16-1)18=120+270=390\\) units.

Therefore option C is correct. The phrase “each next hour” tells us that 18 units are added repeatedly, and the first hour must not be counted as an added step. There are 15 increases between the first and sixteenth hours, not 16. This is why simply calculating \\(120+16(18)\\) would give an incorrect value of 408. The supplied answer and explanation correctly identify the sequence and its 16th term.

Related tags

ApWord-ProblemMachineNth-Term

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