Quote:
Originally Posted by Mr. Hui
Julio is 36 years old, and James is 11 years old. In how many years will Julio's age be twice James's age?

Let x be the number of years.
36 + x = 2(11 + x)
36 + x = 22 + 2x
36 + x  x = 22 + 2x  x
36 = 22 + x
36  22 = 22  22 + x
14 = x
So in 14 years Julio will be 50 and James will be 25.