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3 November, 09:19

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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Answers (1)
  1. 3 November, 09:21
    0
    A=adult tickets

    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
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