How many instance variable does this class have?

Refer to the following UML Class Diagram when answering

this question.

Petage : String

hasFleas : Boolean

licenseNumber : String

weight : float

Pet$()$

Pet$($name : String, age :

int$)$

getName$()$ : String

setName$($name : String$)$ :

void

getAge$()$ : int

setAge$($age : int$)$ : void

speak$()$ : void

scratch$($itches : int$)$ : v

oid

tostring$()$ : String