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0 / 60 seg.
When Tom was 2 years old his sister was half his age. Now, Tom is 100 years old. Then how old is his sister?
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Clue
I AM 19 YEARS OLD AND MY SISTER IS 9. LET X = MY SISTER'S AGE AND Y = MY AGE. Y = X + 10 Y + 1 = 2(X + 1) Y = 2X + 1 SUBSTITUTING THIS RESULT IN OUR FIRST EQUATION, WE HAVE: 2X + 1 = X + 10 X = 9 SO Y = 19 WHEN MY SISTER WAS 5, I WAS 3 TIMES OLDER THAN SHE WAS
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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