anonymous
  • anonymous
In a family, each boy has as many sisters as brothers, but each sister has only half as many sisters as brothers. How many children are there in the family?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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goformit100
  • goformit100
ok
anonymous
  • anonymous
@Decart show me the solution please :)
anonymous
  • anonymous
Ah ok I got it by fingers. But is there any mathematecal equation to solve this kind of problem? Its like a riddle.

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More answers

anonymous
  • anonymous
boys = x girls = y
campbell_st
  • campbell_st
there are 7 children, 4 boys and 3 girls...
anonymous
  • anonymous
@campbell_st can you show me your solution?
campbell_st
  • campbell_st
plenty of options...
cwrw238
  • cwrw238
i find this quite tricky..
anonymous
  • anonymous
two equations two unknowns
campbell_st
  • campbell_st
if you rewrite Decarts equations you have y = -1 and 0.5y - x = 1
anonymous
  • anonymous
oh wait. im still trying to figure it out. its tricky :/
campbell_st
  • campbell_st
for me it was trial and error knowing that there needed to be an odd number of children I knew 3 doesn't work, 5 works for the boy having equal sisters and brothers but doesn't work for the girl, so try 7 works
cwrw238
  • cwrw238
- thats probably the best way i've got a headache trying to create the equations
anonymous
  • anonymous
but we can get them
cwrw238
  • cwrw238
maybe i need another coffee - lol
anonymous
  • anonymous
@cwrw238 haha, my brother too. until he left me here alone :/
anonymous
  • anonymous
brother = x+y sister=x+.5y
anonymous
  • anonymous
.5y when we took one away
anonymous
  • anonymous
sister = 2x+y
anonymous
  • anonymous
brother is actually x+1
anonymous
  • anonymous
x+1brother has x-1+y x-1 being himself
cwrw238
  • cwrw238
1 + 2x = x + y where x = girls, y = boys is one equation
anonymous
  • anonymous
x+1+y=y-1+2x
cwrw238
  • cwrw238
that gives x + 1 = 1 + 2x giving x=0
anonymous
  • anonymous
i formulated an equation XD x - 1 = y y - 1 = x/2
cwrw238
  • cwrw238
x - 1 = 0.5y is another so u have 1 + 2x = x + y x -1 = 0.5y is that right??
anonymous
  • anonymous
@cwrw238 i'll try to solve yours & you try mine :)
cwrw238
  • cwrw238
yes that gives x = 3 y=4
cwrw238
  • cwrw238
oh ok
anonymous
  • anonymous
awesome
cwrw238
  • cwrw238
x - 1 = y y - 1 = 0.5x add x - 2 = 0.5x x = 4 y = 4-1 = 3
cwrw238
  • cwrw238
in your equation x = boys , y = girls right? yours come out right too
anonymous
  • anonymous
ya and yours is x = girls and y = boys,right?
cwrw238
  • cwrw238
yea well done
anonymous
  • anonymous
thank you @cwrw238 :)

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