Guest Posted July 7, 2008 Report Share Posted July 7, 2008 A boy and his big sister are sitting around the kitchen table chatting. “You know, Sis, if I took away two years from my age and gave them to you, you’d be twice my age, huh!” “Well, why don’t you just give me one more on top of that? Then I’ll be three times your age.” So just how old is each sibling? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted July 7, 2008 Report Share Posted July 7, 2008 they are both 6 years old. 6-2=4 and 6+2=8 and 8 is twice as much as 4. 6-3=3 and 6+3=9 and 9 is thrice as much as 3. And those are some pretty smart 6 year olds. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted July 7, 2008 Report Share Posted July 7, 2008 they are both 6 years old. 6-2=4 and 6+2=8 and 8 is twice as much as 4. 6-3=3 and 6+3=9 and 9 is thrice as much as 3. And those are some pretty smart 6 year olds. Yep Quote Link to comment Share on other sites More sharing options...
0 Guest Posted July 7, 2008 Report Share Posted July 7, 2008 Using algebra we can do it so ... 2(x - 2) = x + 2 2x - 4 = x + 2 x = 6 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted July 7, 2008 Report Share Posted July 7, 2008 Using algebra we can do it so ... 2(x - 2) = x + 2 2x - 4 = x + 2 x = 6 only because they happen to be the same age. Really you should set up a system that says 2(x-2)=y+2 and 3(x-3)=y+3 solve for y (y=2x-6 using the top equation) and substitute (3x-9=2x-6+3 in the bottom equation) and then x=6. so does y. Quote Link to comment Share on other sites More sharing options...
0 unreality Posted July 8, 2008 Report Share Posted July 8, 2008 2(x-2) = y+2 2x-4 = y+2 2x = y+6 3(x-3) = y+3 3x-9 = y+3 3x-6 = y+6 thus: 2x = 3x-6 0 = x-6 x=6 and then from there you get y=6 also they are both 6 years old Quote Link to comment Share on other sites More sharing options...
0 Guest Posted July 9, 2008 Report Share Posted July 9, 2008 (edited) They are each 6 years old: 6 - 2=4, 6 + 2 = 8, 4 x 2 = 8. 4 - 1 = 3, 8 + 1 = 9, 3 x 3 = 9. Simple. If it says it's his big sister, then how can they be the same age, you did a typo. Edited July 9, 2008 by SillouhetteMind Quote Link to comment Share on other sites More sharing options...
0 Guest Posted July 9, 2008 Report Share Posted July 9, 2008 If it says it's his big sister, then how can they be the same age, you did a typo.They are each 6 years old: 6 - 2=4, 6 + 2 = 8, 4 x 2 = 8. 4 - 1 = 3, 8 + 1 = 9, 3 x 3 = 9. Simple. It could be just a trick to through you off. It could refer to the physical size, or the simple fact she was born a few seconds before him. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted July 9, 2008 Report Share Posted July 9, 2008 If it says it's his big sister, then how can they be the same age, you did a typo.They are each 6 years old: 6 - 2=4, 6 + 2 = 8, 4 x 2 = 8. 4 - 1 = 3, 8 + 1 = 9, 3 x 3 = 9. Simple. I suspect that, having found out that they are the same age, we assume them to be twins (of which the sister was born first) Either that or 6 years ago their parents had a baby girl and were quick try for another! Quote Link to comment Share on other sites More sharing options...
0 Guest Posted July 9, 2008 Report Share Posted July 9, 2008 The girl was just born seconds before Quote Link to comment Share on other sites More sharing options...
Question
Guest
A boy and his big sister are sitting around the kitchen table
chatting.
“You know, Sis, if I took away two years from my age and gave them
to you, you’d be twice my age, huh!”
“Well, why don’t you just give me one more on top of that? Then
I’ll be three times your age.”
So just how old is each sibling?
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