Just a really fun problem! Which 5 numbers can you ADD to make 20 and unlock the door? Please check out my YouTube Channel "Math Challenge" for the SOLUTION! PRESS the BUTTON 5 TIMES & ADD to 20! Can you unlock the door?PLEASE SUBSCRIBE to my YouTube Channel! It will give me HUGE MOTIVATION to KEEP GOING :)And if you could LEAVE A REVIEW for my problems, you are my new favorite person ;) But seriously, THANK YOU SO MUCH for all that you do everyday in your classrooms! WE ALL ROCK for making