kev71
18.09.2019 •
Mathematics
Exactly 120 tickets were sold for a concert. the tickets cost $12 each for adults, $10 each for seniors, and $6 each for children the number of adult tickets sold was equal to the number of child tickets sold. given that the total revenue from the ticket sales was $1100, the number of senior tickets sold was
a: 110
b: 20
c: 40
d: 2
e: 18
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Ответ:
c=chlderenticekts
s=sinior tickets
a=c
a+c+s=120
2a+s=120
total made is 1100
12a+6c+10s=1100
sub
a=c
12a+6a+10s=1100
add
18a+10s=1100
multiply first equation by -9 and add to other equation
-18a-9s=-1080
18a+10s=1100 +
0a+s=20
s=20
20 senior tickets were sold
answer is B
Ответ:
simplifying both sides, then isolating the variable
Step-by-step explanation:
x= 18 BTW