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0 / 60 seg.
Charlotte is 13 years old. Her father Montague is 40 years old. How many years ago was Charlotte's father four times as old as Charlotte?
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Clue
ONE IN SIX. A DIE HAS NO MEMORY OF WHAT IT LAST SHOWED
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
BILL IS 40, AND BILL JR. IS 12
FOUR YEARS AGO. WHEN CHARLOTTE WAS 9 HER FATHER WAS 36, 4 TIMES HER AGE
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