SOLUTION: At present, Bob is twice as old as Alice. In 20 years time, the ratio of Alice to Bob’s age will be 9:13. How old is Alice now

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Question 1051147: At present, Bob is twice as old as Alice. In 20 years time, the ratio of Alice to Bob’s age will be 9:13. How old is Alice now
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
B=2%2AA
and
%28A%2B20%29%2F%28B%2B20%29=9%2F13
9%28B%2B20%29=13%28A%2B20%29
9B%2B180=13A%2B260
9B-13A=80
Substituting,
9%282A%29-13A=80
18A-13A=80
5A=80
A=16
Then,
B=2%2A16
B=32