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0 / 60 seg.
Mark is 6 years old. His sister Tina is half of his age. So when Mark is 100 years old, how old is Tina?
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N
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9
7
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D
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N
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K
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1
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0
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D
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W
H
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N
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6
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,
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3
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9
4
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C
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M
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1
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A
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9
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9
7
(
9
4
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3
)
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S
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L
D
Clue
THEY ARE 10.5 AND 0.5 YEARS OLD. A COMMON WRONG ANSWER IS 10 AND 1. THIS IS WRONG BECAUSE THE DIFFERENCE IN AGE WOULD BE 9, NOT 10
HIS SISTER IS 99 YEARS OLD. WHEN TOM WAS 2 YEARS OLD, HIS SISTER WAS 1 YEAR OLD. 98 YEARS LATER, HE BECOMES 100 YEARS OLD. AND 98 YEARS LATER, HIS SISTER WILL BE 99 (98 + 1) YEARS OLD
HE IS 16 YEARS OLD. WHEN I WAS 4 YEARS OLD, MY BROTHER WAS 2 YEARS OLD (HALF MY AGE), SO MY BROTHER IS 2 YEARS YOUNGER THAN ME. WHEN I AM 18 YEARS OLD, MY BROTHER WILL BE 16 YEARS OLD AS HE IS 2 YEARS YOUNGER THAN ME
TINA WILL BE 97 YEARS OLD WHEN MARK IS 100 YEARS OLD. WHEN TOM WAS 6 YEARS OLD, TINA WAS 3 YEARS OLD. 94 YEARS LATER, HE BECOMES 100 YEARS OLD. AND 94 YEARS LATER, HIS SISTER WILL BE 97 (94 + 3) YEARS OLD
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