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(一)爷爷今年的岁数是孙女的3倍。12年前,他的岁数则是孙女的5倍,请分别算出爷爷和孙女今年的准确年令。
(A) Grandpa is three times the age of granddaughter this year. Twelve years ago, his age was five times that of his granddaughter. Please calculate the exact year for grandpa and granddaughter respectively.