WTF, brain...

So Chloe is playing this game where she is periodically faced with a series of numbers and she has to figure out the next number in the series. She asks for my help. I get the answer right away. I explain how I got the number. I get it right. WTF brain? Where were those math skills in high school and college?? My theory is that I have always been good with numbers, it's just when they threw in letters that I got all fucked up, lol. But I did teach my brother algebra when I was in 8th grade and he was in 5th, so there's that...But still. It's freaking me out! BOOM, answer, BOOM, answer. It's like it just jumps out at me. Well, I guess everyone is learning new things about themselves in quarantine, right? Mine is that my critical thinking skills are vastly better than I gave myself credit for. Now if I could find a way to make this skill make me money....