A bag contains 15 white balls and 10 black balls, another contains 20 white balls and 15 white balls. if two balls are drawn without replacement from each bag, find the probability that a)all four are black
b)exactly one of the four are white ​

exactly one of the four are white

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.