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0 / 60 seg.
John was asked how old he is. He said, "In 2 years I will be twice as old as I was 5 years ago." How old is John?
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Clue
18 YEARS OLD. LET MY AGE BE X YEARS NOW. MY AGE AFTER 3 YEARS IS (X+3). MY AGE 3 YEARS AGO IS (X-3). SO, NOW WE CAN COME UP WITH AN EQUATION FOR X: X=3(X+3)-3(X-3) SOLVING FOR X WILL GIVE 18
JENNIE IS 12 YEARS OLD. LET X BE JENNIE'S AGE. WE CAN COME UP WITH THE EQUATION: X + 2 = 2(X - 5) SOLVINGO FOR X GIVES 12. IN 2 YEARS TIME, JENNIE WILL BE 14 YEARS OLD. FIVE YEARS AGO, JENNIE WAS 7 YEARS OLD - HALF OF 14
JOHN IS 12 YEARS OLD. IN 2 YEARS, JOHN WILL BE 14 YEARS OLD. 5 YEARS AGO, JOHN WAS 7 YEARS OLD
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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