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#2: Question closed by user avatar Peter Taylor‭ · 2026-08-27T19:49:43Z (21 days ago)
#1: Initial revision by user avatar Mark V‭ · 2026-08-26T19:21:59Z (23 days ago)
What’s Trader Graham’s “cute solution” that skips the algebra?
I transcribe this *Jane Street Trading Mock Interview with Graham (G henceforth) and [Andrea 
Zhang]* (AZ)](https://www.linkedin.com/in/andrea-zhang-32a238171), dated November 8th 2022, 
starting at [14:00/25:42](https://youtu.be/NT_I1MjckaU?si=Z6xkdn5eNGq3RBLh). please elaborate this "cute way" to skip the algebra? why does this "cute way"  work "to skip the algebra"? 


>G: And I guess there is a cute way to see this. 
So, you, I think, calculated that you were gonna make about $500 dollars over 100 turns, right? So how much money can you make each turn, roughly?


>A: 5 bucks.

>

>G: So, should you spend a turn picking up a 7?

>

>A: OHHHH!!!

>

>G: Yea!

>

>A: That makes a lot of sense.

>

>G: That way, you get to skip the algebra.

>

>A: That’s really nice.