A marketing goal:  Keep it simple. 
Easy,  right?  Simple is hard.  

Sometimes we over-think it. Like a math problem.
And if it were simple, everyone would get it right, right?

PS:  The correct answer is “9”!  
Don’t hate me, hate the rules of mathematics.  I thought the answer was “1” too. Who knew?

Here’s the proof: https://lnkd.in/eSQpi2Y