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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
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
TERRY IS 5 YEARS OLD. LET'S TRANSLATE WORDS TO MATH. "ALICE WAS FIVE YEARS OLDER THAN TERRY IS NOW" TRANSLATES TO: A = 5 + T, WHERE A IS THE AGE OF ALICE AND T IS THE AGE OF TERRY. NOW TRANSLATE AGAIN. "TERRY IS HALF AS OLD AS ALICE WAS" BECOMES : T = (1⁄2)A. SOLVING THE TWO EQUATIONS WILL GIVE T = 5
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