There are 8 red tegu lizards in the reptile house at a local zoo. If the average length of the red tegu lizards is 10 inches, then how many of the red tegu lizards are exactly 10 inches long?

number of red ten inch tegu lizard = even number between 0 and 8

Step-by-step explanation: if the average length is 10, assigning 10 to only one lizard won't give us average of ten, it also means assigning 10 to odd number between 1 and 7 inclusive won't give us that average, so it's either it's no lizard with length 10 or even number of lizard between 0 and 8.

A digraph is said to be Orientable if there exists an orientation (a selection of arc directions) that makes strongly connected (there exists a directed path between each pair of vertices).