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  20x
new scenario:
older sister  2x
younger  20x  3 = 17x
2x + 17x = 30
x = 13
so now the older has 13, the younger has 7
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