Posted by **teresa** on Wednesday, September 15, 2010 at 12:45am.

two sisters together have 20 books. if the younger sister lost 3 books and the older sister doubled the number she has, they would have a total of 30 books. How many books does each have?

- algebra -
**Johnny**, Wednesday, September 15, 2010 at 2:40am
The older has 26 and the younger 4

- algebra -
**Reiny**, Wednesday, September 15, 2010 at 8:04am
Now:

older sister --- x

younger sister --- 20-x

new scenario:

older sister --- 2x

younger --- 20-x - 3 = 17-x

2x + 17-x = 30

x = 13

so now the older has 13, the younger has 7

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