Do your students know this simple trick of finding the AVERAGE of consecutive numbers? Have them TRY IT OUT and SEE :) 
 
Please check out my YouTube Channel "Math Challenge" for the SOLUTION!　SCAN that QR Code to take you right to the video!
 
I would be SUPER DELIGHTED AND HAPPILY EMBARRASSED LOL if you showed my video to your class explaining the solution! 
 
If you LOVE these types of problems, as a beginning YouTuber, 
it would help me out so much if you could SUBSCRIBE TO MY YouTube Channel! 
 
Also I would LOVE to know how the problem worked out for your kiddos :) 
Any requests for future problems is greatly appreciated!
 
THANK YOU SO MUCH!! 
 
E-mail: knishimori@bridgemath.com