the cost＄C for a party with Nparticipants is given by C ≡1200+20N.
（a ）if the cost of the party is ＄3000.find the number of participants.
（b）if there are 15participantsin the party,find the cost.
數學題（emglish）
2007-02-22 9:13 pm
回答 (5)
2007-02-22 9:21 pm
✔ 最佳答案
a. when cost = $30003000 = 1200+20N
1800 = 20N
N = 90
So,the number of participants is 90
b. when participantsin is 15
C = 1200+20(15)
= 1200+300
= 1500
So,the cost is $1500
參考: me
2007-02-22 9:54 pm
(a) if C=3000
3000=1200+20N
3000-1200=20N
1800=20N
1800/20=20N/20
90=N
So that, the number of participants is 90.
(b) 15*90
= 1350
The cost is 1350.
3000=1200+20N
3000-1200=20N
1800=20N
1800/20=20N/20
90=N
So that, the number of participants is 90.
(b) 15*90
= 1350
The cost is 1350.
2007-02-22 9:37 pm
（a ）if the cost of the party is ＄3000.find the number of participants.
3000≡1200+20N
3000-1200≡20N
1800≡20N
1800/20≡N
N≡90
the number of participants is 90.
（b）if there are 15participantsin the party,find the cost.
The cost of each participant is 3000/90
Therefore, the cost of 15participants in the party is 3000/90 x15 = $ 500
3000≡1200+20N
3000-1200≡20N
1800≡20N
1800/20≡N
N≡90
the number of participants is 90.
（b）if there are 15participantsin the party,find the cost.
The cost of each participant is 3000/90
Therefore, the cost of 15participants in the party is 3000/90 x15 = $ 500
2007-02-22 9:22 pm
(a)
C=1200+20N
3000=1200+20N
N=90
(b)
C=1200+20N
C=1200+20x15
C=$1500
C=1200+20N
3000=1200+20N
N=90
(b)
C=1200+20N
C=1200+20x15
C=$1500
2007-02-22 9:21 pm
（a ）if the cost of the party is ＄3000.find the number of participants.
3000≡1200+20N
3000-1200≡20N
1800≡20N
1800/20≡N
N≡90
the number of participants is 90.
（b）if there are 15participantsin the party,find the cost.
The cost of each participant is 3000/90
Therefore, the cost of 15participants in the party is 3000/90 x15 = $ 500
3000≡1200+20N
3000-1200≡20N
1800≡20N
1800/20≡N
N≡90
the number of participants is 90.
（b）if there are 15participantsin the party,find the cost.
The cost of each participant is 3000/90
Therefore, the cost of 15participants in the party is 3000/90 x15 = $ 500
收錄日期: 2021-04-30 22:27:23
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070222000051KK01849