Help Me Please!!?
2015-05-25 9:46 pm
At a movie theater, child admission is $6.30 and adult admission is $9.50. On Wednesday, 168 tickets were sold for a total sales of $1311.20. How many child tickets were sold that day?
回答 (4)
2015-05-25 9:53 pm
✔ 最佳答案
"child admission is $6.30 and adult admission is $9.50"c and a are the number of child and adult tickets, respectively.
sales = 6.30c + 9.50a
"168 tickets were sold for sales of $1311.20"
c+a = 168
a = 168-c
6.30c + 9.50a = 1311.20
substitution:
6.30c + 9.50(168-c) = 1311.20
c = 89
2015-05-25 9:53 pm
168=a+c solving for a gives, a=168-c
9.5a+6.3c=1311.2 and using a=168-c make the equation become:
9.5(168-c)+6.3c=1311.2
1596-9.5c+6.3c=1311.2
1596-3.2c=1311.2
-3.2c=-284.8
c=89
So 89 child tickets were sold that day...
9.5a+6.3c=1311.2 and using a=168-c make the equation become:
9.5(168-c)+6.3c=1311.2
1596-9.5c+6.3c=1311.2
1596-3.2c=1311.2
-3.2c=-284.8
c=89
So 89 child tickets were sold that day...
2015-05-25 11:33 pm
c+a=168, a=168-c, 6.30c+9.50a=1311.20, 630c+950a=131120, 630c+950(168-c)=131120, 630c+159600-950c=131120, 630c+159600=131120+950c, 159600=131120+320c, 28480=320c, c=89, 89+a=168, 89+79=168, 6.30(89)+9.50(79)=1311.20, 560.70+750.50=1311.20, 1311.20=1311.20, 89 child tickets sold.
收錄日期: 2021-04-21 01:54:00
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150525134605AAutH40