It's common in traditional Algebra I classes to ask students to sum consecutive integers. In 2015, I wrote about how I've used this with younger students on Chanukah.
I've always wanted to use a Sukkot application of this problem, since the Parot He'Chag (bulls of the mussaf offering) are offered as decreasing consecutive integers.
Last year, I did so as a bonus question on my word problems test (in November; this unit's never coincided with Sukkot itself.)
First, the students defined their variables and wrote an equation:
Then, they combine like terms and solve for the variable. Note that they solve for the number of bulls offered on the first day.