Peter is 7 years older than his sister. 9 years ago, he was
twice as old as his sister. How old is Peter now?
F.2 Maths Questions
2009-02-06 7:32 am
回答 (2)
2009-02-06 7:49 am
✔ 最佳答案
Let P be the age of Peter now.therefore the age of sister is P-7 now.
9 years ago, Peter's age is P-9, and his sister's age is P-7-9 = P-16
He was twice as old as his sister 9 years ago, so
P-9 = 2 * (P-16) = 2P-32
P = 23
Therefore Peter's age is 23 years old now.
2009-02-06 7:58 am
ihaveans ( 碩士級 3 級 )
Thank you so much!
Thank you so much!
收錄日期: 2021-04-19 13:31:05
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090205000051KK02431