by Serhiy Grabarchuk Jr
Eleven matchsticks are arranged into two digits: 6 and 3, resulting in three numbers: 6, 3, and 63. Their total is 6 + 3 + 63 = 72.
It is possible to move just one matchstick to a new position in order to end up with other three numbers which produce a different total. All but one total are possible to be reached in that way.
Which total is not achievable?
Only one total among those provided is not achievable: 79.