Question 253406
Given, 3 times Jane's age in years, is equal to 8 times Beth's age in years 
Let the age of Jane be 8x.
Then the age of Beth is 3x.
The difference in ages is 8x-3x = 15
                           5x   = 15
                              x = 15/5
                              x = 3
So the age of Beth is  = 3x = 3*3 = 9
And the age of Jane is = 8x = 8*3 = 24