Lets pull the sentence apart.
Cameron is sixty and a half inches tall
Cameron= 60 1/2
Kayla is one fifth of an inch taller than cameron
Kayla= 1/5 + 60 1/2
1/5 = 0.2
60 1/2 = 60.5
ADd them together
60.5+0.2 = 60.7
Therefore,
Kayla is 60.7 inches tall