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An old man said to a young man, "I have a daughter. She has as many brothers as she has sisters. Each one...............

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An old man said to a young man, "I have a daughter. She has as many brothers as she has sisters. Each one of her brothers has twice as many sisters as he has brothers. How many sons and daughters do I have?"

posted Nov 18 by Mohammad

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2 Answers

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4 daughters and 3 sons
4-1=3
3-1=2*2

answer Nov 18 by Hanifa Mammadov
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Say
Total number of sons = x and
Total number of daughters = y

"She has as many brothers as she has sisters"
number of her sisters = y-1
So
x = y-1 -- (1)

"Each one of her brothers has twice as many sisters as he has brothers"
number of his brothers = x-1
number of his sisters 2(x-1)
So
y = 2(x-1) -- (2)

Substituting y value from (2) in (1)
x = 2(x-1) - 1 = 2x - 3
That is x = 3 and y = 4
Hence
Number of sons = 3
Number of daughters = 4

answer Nov 20 by Murthy K V M



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