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There’s nothing like a simple math problem to make you feel really stupid.

PeerieBresks posted a simple math riddle on Mumsnet, a parenting forum, and it racked up over 500 comments because people couldn’t agree on the correct answer.

Here’s the question:

A man buys a horse for $60. He sells the horse for $70. He then buys the horse back for $80. And he sells the horse again for $90. In the end, how much money did the man make or lose? Or did he break even?

Most of the Mumsnet users posted a sum between $10 and $30 and a few even said he broke even.

What do you think?

Scroll down for the answer.

The correct answer is: $20

The best way to tackle the problem is to approach each transaction as separate: -60 + 70 = 10 and -80 + 90 = 10.

The man made $10 with each transaction which adds up to $20.

This article originally on someecards.

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