MediumMathematicsHigh School (9–10)GeneralAlgebra › Sequences and SeriesNumericalword problemBoard Exam
Logs are stacked with 24 in the bottom row, 23 in the next, and so on, with 9 logs in the top row…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Logs are stacked with in the bottom row, in the next, and so on, with logs in the top row. How many rows are there, and how many logs?
Need a reminder? The key ideaShow
In a word problem, find the quantity that changes by a fixed amount: that is the common difference . Read and with their units. A single amount is a term, ; a total is a sum, .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The rows. , so .
Step 2. The logs. .
Answer: rows and logs.
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