# Brothers and sisters

Lenka has as many brothers as sisters. Her brothers have twice as many sisters as brothers. How many brothers and sisters are in the family?

Correct result:

b =  3
s =  4

#### Solution:

b=s-1; 2(b-1)=s

b=s-1
2•(b-1)=s

b-s = -1
2b-s = 2

b = 3
s = 4

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