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a. 13

Step-by-step explanation:

x - youngest sister

x + 1 - middle sister

x + 1 + 1  - oldest sister

x + x + 1 + x + 1 + 1 = 39

3x + 3 = 39

3x = 36

x = 12

x+ 1 = 12 + 1 = 13

answer: bea's uncle is 25 years old.

step-by-step explanation:

given the equation , we can say that the variable "x" represents the age of bea's uncle. then to find his age, we need to solve for "x":

we must add 15 to both sides of the equation:

now we need to divide both sides of the equation by 3:

therefore, we can conclude that bea's uncle is 25 years old.