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Puzzle
- US Version
Two sisters are talking about their ages:
"One year ago, I was exactly half as old as you," said the younger one.
The older sister replies: "Even one year from now, your age will be half my age. Here, look, if we split the numbers into two parts, top and bottom, they both give your age in a year's time."
"Hey, you're right. That's really cool!"
How old is the little sister?
- UK Version
Two sisters are talking.
"One year ago, my age was exactly half your age", says the younger sister. The older sister replies: "Even one year from now, your age will be half my age. Here, look, if we split the numbers into two parts, top and bottom, they both give your age in a year's time."
"Wow, you're right!"
How old is the younger sister now?
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Solution
Incorrect
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Correct
- US Version
Correct!
The little sister is nine years old.
The older sister is 17. A year ago, the older sister was 16 and the younger was eight, so she was half the age of the older one.
A year from now, the older sister will be 18 and the younger one 10. If you divide an 18 into a top half and a bottom half, each one is a 10!
- UK Version
That's right!
The younger sister is currently 9 and the older sister is 17.
One year ago, the older ister was 16 and the younger sister was 8, half her sister's age. One year from now, the older sister will be 18 and the younger sister will be 10. Splitting 18 horizontally gives you 10 twice.
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