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How many boys and girls are in the family?

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Dinesh has the same number of brothers as sisters.
His sister, Lavanya, has twice as many brothers as she has sisters.
How many boys and girls are in the family?

posted Nov 4 by Divya Bharti

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1 Answer

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Dinesh has -> br & si
br=si --------> (1)
Lavanya has -> br+1 & si-1 ---- adding Dinesh and discounting Lavanya
br+1=2*(si-1) --------> (2)
kids= ? = 1+br+si (adding Dinesh)
Combining (1) & (2) --> si+1=2si-2 --> si=3 & br=3
kids = 1+3+3 = 7

answer Nov 4 by Hanifa Mammadov

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