Question 343014
Frank's current age = x + 4


Bill's current age = x


(x + 4) - 5 = 2(x - 5)


x - 1 = 2x - 10


x - 2x = -10 + 1


-x = -9


x = -9/-1


x = 9


Frank is 9 + 4 years old or 13 years old.