[問題]GWD-6-12

[Grace]

Q12:
For a certain play performance, adults’ tickets were sold for $12 each and children’s tickets were sold for $8 each. How many children’s tickets were sold for the performance?
(1)The total revenue from the sale of adults’ and children’s tickets for the performance was $5,040.
(2)The number of adults’ tickets sold for the performance was 1/3 the total number of adults’ and children’s tickets sold for the performance.


Answer: C.

請教大大們這題為何是C.
(1) 12X+8Y=5040
(2) Adult: 1/3(x+y) children: Y

1+2==> 1/3(X+Y)+8Y=5040

我式子是不是列錯了呢???

[homaru]

(1)12x+8y=5040
(2)x=1/3*(x+y)-->2x=y

(2)代入(1)
6y+8y=5040,y=360