Question 919419: ten years from now, Anna will be twice as old as Barbara. Five years ago, Anna was three times as old as barbara, what are the present ages of Anna and Barbara?
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! let a = Ann's present age
let b = Barbara's age
:
write an equation for each statement, simplify as much as possible.
:
ten years from now, Anna will be twice as old as Barbara.
a + 10 = 2(b+10)
a + 10 = 2b + 20
a = 2b + 20 - 10
a = 2b + 10
Five years ago, Anna was three times as old as Barbara,
a - 5 = 3(b-5)
a - 5 = 3b - 15
a = 3b - 15 + 5
a = 3b - 10
replace with (2b+10)
2b + 10 = 3b - 10
10 + 10 = 3b - 2b
20 = b
Barb is 20 yrs old
then
a = 2(20) + 10
a = 50 yrs for Ann
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You can check these solutions in both statement
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