Derek is 7 years ypunger than Frankie. Helen is three-quarters the age of Derek. Gary is 9 years older than Helen. If Gary is 24, how old is Frankie?
Show ateps and use algebra.
THX``
F.1 maths
2007-04-14 12:34 am
回答 (3)
2007-04-14 12:38 am
✔ 最佳答案
Let the age of Frankie is a.(a-7)x3/4 +9=24
(a-7)x3/4=15
a-7=20
a=27
Frankie is 27.
2007-04-13 17:37:41 補充：
a-7係Derek(a-7)x3/4係 Helen (a-7)x3/4 9係Gary
2007-04-14 1:31 am
Let the age of Frankie is a.
3(a-7)/4 +9=24
3(a-7)/4=15
a-7=20
a=27
Frankie is 27
3(a-7)/4 +9=24
3(a-7)/4=15
a-7=20
a=27
Frankie is 27
2007-04-14 12:42 am
Let Derek be D, Frankie be F, Helen be H and Gary be G
F+7=D (1)
3/4D=H (2)
G-9=H (3)
If G=24, then from (3)
G-9=H
24-9=15
H=15
Then from (2)
3/4D=15
D=20
Then (1) gives
F+7=D
F=20-7=13
Therefore, Frankie is 13yrs old.
Thanks
F+7=D (1)
3/4D=H (2)
G-9=H (3)
If G=24, then from (3)
G-9=H
24-9=15
H=15
Then from (2)
3/4D=15
D=20
Then (1) gives
F+7=D
F=20-7=13
Therefore, Frankie is 13yrs old.
Thanks
收錄日期: 2021-04-13 00:34:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070413000051KK03592