Q9:
How many years did Dr. Jones live?
(1) If Dr. Jones had become a doctor 10 years earlier than he did,
he would have been a doctor for exactly 2/3 of his life.
(2) If Dr. Jones had become a doctor 10 years later than he did,
he would have been a doctor for exactly 1/3 of his life.
ANS: C
可以請教此題列式嗎...
我知道答案是c，可是我不太清楚如何列式。腦筋有點轉不過來...@@
請指點迷津，thanks a lot...
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