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Math and Arithmetic

In a family each daughter has the same number of brothers as sisters while each son has twice as many as sisters as brothers then how many sons and daughters are in the family?



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This family has 4 girls and 3 boys.

Here is how to get the answer:

Assume the family has X girls and Y boys, according to the question, we can come up with 2 equations:

X-1=Y, 2(Y-2)=X.

Solve the equations, we get X=4, Y=3.