@inventiveantelope Doesn't really matter.

@smilingtadpole-1 In this problem, we do not care whether 11 has one or two 1s. What matters is the fact that 11 contains a 1. When you solved this problem, you assumed that because 11 had two ones, it should be counted twice, which is incorrect. I hope this helps!(also charge your device lol)

@RZ923
Yeah! A lot of times in math using ideas in geometry may help, just like the hockey stick identity! You can flip the point of the stick to the other to make it symmetrical.

uhhh i play minecraft, genshin impact, and roblox (if my friend is forcing me too)
on my phone i play cookie run kingdom

Thanks for the explanation. I guess I didn’t think that the card had numbers on both sides. But it makes sense now.

@quacker88 Hi! Thanks for the helpful explanation because I had the same question victorioussheep did. It's just when I tried to solve the problem you gave, I got the answer B/(B-A).

(1/A-1/B)t=1 Simplifying (1/A-1/B), I get (B-A/AB)t=1 and so t= AB/B-A. t is the time it takes for the first runner to catch up with the second runner. So the number of laps the first runner runs is AB/B-A divided by A which is B/B-A.

Also, I think how Prof. Loh got A/A-B was by solving for the number of laps the trainer or the second runner was running.

I don't know if this is correct, but I hope you can look over my work. Thanks!

@productiveotter Yes, you're right; it is wrong (see attached screenshot). Unfortunately, it looks like nobody from the Daily Challenge team is fixing this.

@po @thomas @audrey @debbie Please respond, thank you!

Mathway.com/Algebra Solution