Question 1048724: The sum of the ages of Gina and Bill is 20 years. In Five years time, Gina will be twice as old as Bill. How old are Gina and Bill now?
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! let g = Gins's age
let b = Bill's age
:
write an equation for each statement, simplify as much as you can
The sum of the ages of Gina and Bill is 20 years.
g + b = 20
In Five years time, Gina will be twice as old as Bill
g + 5 = 2(b+5)
g + 5 = 2b + 10
g = 2b + 10 - 5
g = 2b + 5
How old are Gina and Bill now?
in the first equation, replace g with (2b+5)
(2b+5) + b = 20
3b = 20 - 5
3b = 15
b = 15/3
b = 5 yrs is Bills age
then obviously
20 - 5 = 15 yrs is Gina's age
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Check this in the 2nd statement
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