Try To Solve This Impossible Problem From Across History

If a man buys a horse for $60, sells it for $70, buys it back for $80, and sells it again for $90, the trick is to approach each transaction as separate:
-60 + 70 = 10
-80 + 90 = 10
The man made $10 with each transaction, therefore his profit adds up to $20.
Did you approach it differently? Let us know in the comments, and SHARE this problem to test your friends.

Check Also

I Forgot to Leave Lunch Money for My Son, but He Said, 'Don't Worry, Mom. I'll Look in the Cereal Box Where Dad Hides It'

I Forgot to Leave Lunch Money for My Son, but He Said, ‘Don’t Worry, Mom. I’ll Look in the Cereal Box Where Dad Hides It’

After Jess forgets to leave lunch money for her son, Caleb, he reveals that there's …